Feature/inputviz

[200sc]

Add input visualization helpers underneath debug tools.

• Joystick
• Mouse
• Keyboard

[codecov-commenter]

Codecov Report

Merging #169 (e7c6150) into master (314b923) will decrease coverage by 0.02%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##           master     #169      +/-   ##
==========================================
- Coverage   92.76%   92.73%   -0.03%     
==========================================
  Files         140      140              
  Lines        6291     6294       +3     
==========================================
+ Hits         5836     5837       +1     
- Misses        398      399       +1     
- Partials       57       58       +1     

Impacted Files	Coverage Δ
render/font.go	69.23% <ø> (ø)
render/text.go	97.18% <50.00%> (-2.82%)	⬇️

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[200sc]

This also:

• adds support for https://docs.microsoft.com/en-us/windows/win32/winmsg/wm-inputlangchange on windows, although we don't propagate that message down (yet), its just used by shiny
• adds AllKeys to the key package, a set of all supported keys.
• deprecates render.DefFontGenerator in favor of DefaultFontGenerator.
• drops the keyboard-test example

bugs fixed:

• respect the context passed into debugtools.DebugMouseRelease
• adds support for the Insert key on windows (an oversight before)
• corrects the drawn location of texts drawn with a zero size font