Refactor display code to be Screen centric

[SimonDanisch]

Loosely a continuation of #2012, but really Rabbit holed into a refactor of the display code.
Screen is now the holder of all display related information like device_scaling_factor, desired output type and things like visibility

This PR adds:

• saving/recording with backend keyword
• better and consistent screen constructors between backends, with a clear purpose of what they do
• cleaned up display code and more consistent use of display
• removed backend_display + inline! since they're somewhat redundant at this point
• CairoMakie opens plots in OS image viewer/browser

..And some more docs and clean ups to come

[MakieBot]

Compile Times benchmark

Note, that these numbers may fluctuate on the CI servers, so take them with a grain of salt. All benchmark results are based on the mean time and negative percent mean faster than the base branch. Note, that GLMakie + WGLMakie run on an emulated GPU, so the runtime benchmark is much slower. Results are from running:

using_time = @ctime using Backend
# Compile time
create_time = @ctime fig = scatter(1:4; color=1:4, colormap=:turbo, markersize=20, visible=true)
display_time = @ctime Makie.colorbuffer(display(fig))
# Runtime
create_time = @benchmark fig = scatter(1:4; color=1:4, colormap=:turbo, markersize=20, visible=true)
display_time = @benchmark Makie.colorbuffer(display(fig))

	using	create	display	create	display
GLMakie	29.79s (29.53, 30.17) 0.22+-	18.55s (18.46, 18.67) 0.07+-	16.53s (16.38, 16.67) 0.12+-	17.68ms (17.34, 17.88) 0.21+-	50.10ms (49.55, 50.49) 0.37+-
master	29.52s (29.27, 29.80) 0.18+-	18.54s (18.41, 18.73) 0.10+-	17.21s (17.07, 17.40) 0.13+-	16.42ms (15.96, 16.71) 0.25+-	142.63ms (141.12, 144.74) 1.44+-
evaluation	+0.91%, 0.27s slower X (1.35d, 0.03p, 0.20std)	+0.05%, 0.01s invariant (0.10d, 0.86p, 0.09std)	-4.13%, -0.68s faster ✓ (-5.52d, 0.00p, 0.12std)	+7.12%, 1.26ms slower❌ (5.41d, 0.00p, 0.23std)	-184.68%, -92.53ms faster✅ (-87.84d, 0.00p, 0.91std)
CairoMakie	31.45s (31.28, 31.59) 0.09+-	22.78s (22.53, 23.09) 0.17+-	3.16s (3.11, 3.21) 0.03+-	22.50ms (22.03, 22.87) 0.27+-	27.65ms (27.27, 27.98) 0.27+-
master	30.78s (30.68, 30.88) 0.07+-	22.71s (22.51, 22.82) 0.12+-	3.66s (3.59, 3.71) 0.04+-	20.26ms (19.73, 20.71) 0.31+-	29.78ms (29.66, 29.92) 0.09+-
evaluation	+2.11%, 0.66s slower X (7.98d, 0.00p, 0.08std)	+0.32%, 0.07s invariant (0.49d, 0.38p, 0.15std)	-15.98%, -0.5s faster✅ (-13.81d, 0.00p, 0.04std)	+9.96%, 2.24ms slower❌ (7.68d, 0.00p, 0.29std)	-7.72%, -2.13ms faster✅ (-10.48d, 0.00p, 0.18std)
WGLMakie	33.49s (32.61, 34.03) 0.45+-	30.38s (29.54, 30.89) 0.50+-	44.47s (43.88, 45.26) 0.48+-	26.04ms (23.44, 37.10) 4.91+-	83.45ms (73.12, 92.21) 7.60+-
master	33.46s (33.02, 33.78) 0.27+-	29.48s (29.13, 30.00) 0.31+-	45.32s (44.90, 45.86) 0.38+-	21.77ms (21.30, 22.11) 0.29+-	1.74s (1.70, 1.77) 0.03+-
evaluation	+0.10%, 0.03s invariant (0.09d, 0.87p, 0.36std)	+2.96%, 0.9s slower X (2.16d, 0.00p, 0.41std)	-1.91%, -0.85s faster ✓ (-1.96d, 0.00p, 0.43std)	+16.40%, 4.27ms noisy🤷‍♀️ (1.23d, 0.06p, 2.60std)	-1979.27%, -1651.69ms faster✅ (-83.79d, 0.00p, 17.21std)

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[SimonDanisch]

Final summary of changes:

GLMakie Bug fixes

• Fix Heisenbug for multiple windows, where shaders got compiled for the wrong window (OpenGL context), which works fine on most nvidia hardware but may crash other OpenGL implementations.
• Due to the above fix, it became clear that the scene clean up after displaying on a screen wasn't happening correctly, which got fixed
• SSAO/FXAA/transparency_weight_scale were a global, which was fine until we got multi window support. Now, ssao/fxaa/oit are screen options, which you can set via GLMakie.activate!(ssa=true) or per screen via GLMakie.Screen(ssa=true).

Saving + record

• new backend argument, allowing one to save a file with a specific backend (save("plot.png", figure; backend=GLMakie)). Applies also to record, display and colorbuffer.
• record, display, colorbuffer and save now support forwarding all Backend.Screen options, which enables you to use record(...; px_per_unit=2.0) for higher resolution videos with CairoMakie, or e.g. save(...; backend=GLMakie, ssao=true).
• All backend screen types have been renamed to Backend.Screen, which was previously not the case. This shouldn't break too much code, since the only backend where one was interacting with Screen is GLMakie, which was already named Screen. In the future, it will be more common to interact with Screen directly for all backends. Use ?Backend.Screen to see all screen options.

Speed and allocation improvements for record

We gained some substantial speed improvements for record, by reusing more screen state and directly writing out to a file via ffmpeg #2231.

GLMakie

PR:     171.387 ms (57775 allocations: 4.93 MiB)
master: 322.244 ms (50714 allocations: 32.58 MiB)

CairoMakie

PR:     647.093 ms (3076666 allocations: 174.11 MiB)
master: 807.175 ms (3070484 allocations: 335.48 MiB)

WGLMakie

PR:     1.450 s (2200125 allocations: 189.61 MiB)
master: 1.628 s (2192751 allocations: 279.25 MiB)

Other

• adding more tests for display / record
• CairoMakie now opens a browser/os-image-viewer when plotpane is disabled or display(fig) is called explicitely.
• deprecation of Makie.inline!(false/true) which was only disabling show, which isn't very helpful (can just be done by fig; or return nothing) and was instead making trouble accidantely disabling show.
• deprecating GLMakie.set_window_config!(; screen_config...) in favor of GLMakie.activate!(; screen_config...).
• deprecating internal function backend_display in favor of display.
• cleaning up colorbuffer(figlike) and colorbuffer(screen), making it faster and more consistent across backends.
• clean up of unused code and making code more consistent between backends
• backend is now registered as module not it's own GLMakieBackend struct. Deprecated internal global current_backend in favor of CURRENT_BACKEND and renaming register_backend! to set_active_backend!. One can now query the current backend via Makie.current_backend()::Module
• Backend.activate!(; screen_config...) now always accepts attributes for the backends screen config, and writes it to the theme. Alternatively, one can use set_theme!(Backend=(screen_config...,))
• better warnings for wrong ffmpeg flags in record/Record

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