Fix small issues throughout the codebase

[Laguna1989]

No description provided.

[codecov-commenter]

Codecov Report

Merging #297 (5f17cbd) into master (7a216c2) will increase coverage by 1.41%.
The diff coverage is 97.61%.

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@@            Coverage Diff             @@
##           master     #297      +/-   ##
==========================================
+ Coverage   94.07%   95.49%   +1.41%     
==========================================
  Files         178      178              
  Lines        4206     4197       -9     
==========================================
+ Hits         3957     4008      +51     
+ Misses        249      189      -60     

Files	Coverage Δ
...template/common/audio/fades/sound_fade_manager.cpp	100.00% <100.00%> (ø)
...mpl/jamtemplate/common/audio/sound/sound_group.cpp	100.00% <100.00%> (+10.98%)	⬆️
...mpl/jamtemplate/common/audio/sound/sound_group.hpp	100.00% <ø> (ø)
...jamtemplate/common/audio/sound/sound_interface.hpp	100.00% <ø> (ø)
impl/jamtemplate/common/audio/sound/sound_null.cpp	100.00% <100.00%> (+11.11%)	⬆️
impl/jamtemplate/common/color/palette_builder.cpp	97.82% <100.00%> (ø)
impl/jamtemplate/common/game_object_collection.cpp	100.00% <100.00%> (ø)
...l/jamtemplate/common/input/mouse/mouse_defines.cpp	100.00% <100.00%> (ø)
impl/jamtemplate/common/object_group.hpp	100.00% <100.00%> (ø)
impl/jamtemplate/common/particle_system.hpp	100.00% <100.00%> (ø)
... and 10 more

... and 7 files with indirect coverage changes

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