Better naming for rendering classes, functions and variables

[AlanGriffiths]

No description provided.

[codecov]

Codecov Report

Merging #3079 (79622a9) into platform-API-merge (a77df47) will increase coverage by 0.02%.
The diff coverage is 70.00%.

@@                  Coverage Diff                   @@
##           platform-API-merge    #3079      +/-   ##
======================================================
+ Coverage               75.91%   75.94%   +0.02%     
======================================================
  Files                    1058     1058              
  Lines                   74084    74005      -79     
======================================================
- Hits                    56239    56200      -39     
+ Misses                  17845    17805      -40     

Files	Coverage Δ
include/platform/mir/graphics/platform.h	85.29% <100.00%> (ø)
...tforms/renderer-generic-egl/rendering_platform.cpp	80.28% <100.00%> (ø)
src/server/compositor/default_configuration.cpp	96.42% <100.00%> (ø)
...lude/mir/test/doubles/mock_gl_rendering_provider.h	60.00% <ø> (ø)
...lude/mir/test/doubles/stub_gl_rendering_provider.h	86.95% <ø> (ø)
...ation-tests/test_surface_stack_with_compositor.cpp	94.41% <ø> (ø)
tests/mir_test_framework/headless_test.cpp	88.23% <100.00%> (ø)
...s/mir_test_framework/stubbed_graphics_platform.cpp	83.67% <100.00%> (ø)
tests/mir_test_framework/test_display_server.cpp	87.50% <100.00%> (ø)
...nit-tests/compositor/test_basic_screen_shooter.cpp	93.15% <ø> (ø)
... and 7 more

... and 17 files with indirect coverage changes

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[RAOF]

Yeah, I agree that's better.