BF: Mouse coordinate mapping on retina displays

[mdcutone]

Fixes the issue that mouse coordinates are incorrectly mapped to window coordinates on macOS. Tested on the office Mac here without a retina display (same problem as before), need someone to check on a real retina display if the fix works there too.

Furthermore, the fix should apply to HiDPI displays on other platforms too since we're using the new setContentScaleFactor() method which generalizes mapping between window and framebuffer coordinates in cases where they differ in size.

[TEParsons]

Unfortunately this doesn't work on retina :( When I run this experiment:
untitled.zip
the text is only True when the mouse is in the top right corner

[mdcutone]

I think I needed to apply these changes to the pyglet backend directly since it handles coordinates differently and overrides the underlying conversion methods of the base class. Hope it works now!

[mdcutone]

Converted to a draft, don't pull in until we confirm this fixes the issue across different Mac configurations (i.e. retina/non-retina).

[TEParsons]

It works on my retina screen! I'll figure out what this textbox glyph test bug is and submit a separate PR for it

[codecov]

Codecov Report

Merging #4755 (facca10) into release (9fcdb76) will increase coverage by 0.01%.
The diff coverage is 25.00%.

@@             Coverage Diff             @@
##           release    #4755      +/-   ##
===========================================
+ Coverage    45.32%   45.33%   +0.01%     
===========================================
  Files          294      294              
  Lines        58845    58849       +4     
  Branches     10393    10393              
===========================================
+ Hits         26671    26682      +11     
+ Misses       29793    29784       -9     
- Partials      2381     2383       +2     

Impacted Files	Coverage Δ
psychopy/visual/backends/_base.py	66.94% <0.00%> (-1.16%)	⬇️
psychopy/visual/backends/pygletbackend.py	47.43% <50.00%> (+0.01%)	⬆️
psychopy/visual/textbox2/textbox2.py	78.88% <0.00%> (+1.24%)	⬆️

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