Move rwviewer into rwgame with imgui

[danhedron]

This removes a lot of stuff that's needed just for Qt and simplifies the code.

A few things left to match functionality with rwviewer

• [x] Free-cam map viewer

• [x] Make it possible to remove viewed objects

[codecov[bot]]

Codecov Report

Merging #719 into master will increase coverage by 0.59%. The diff coverage is 0%.

@@            Coverage Diff             @@
##           master     #719      +/-   ##
==========================================
+ Coverage   18.12%   18.72%   +0.59%     
==========================================
  Files         252      229      -23     
  Lines       22938    22211     -727     
  Branches     5769     5795      +26     
==========================================
  Hits         4158     4158              
+ Misses      17659    16935     -724     
+ Partials     1121     1118       -3

Impacted Files	Coverage Δ
rwgame/RWGame.hpp	0% <ø> (ø)	:arrow_up:
rwgame/main.cpp	0% <0%> (ø)	:arrow_up:
rwgame/RWConfig.inc	46.66% <0%> (-3.34%)	:arrow_down:
rwgame/viewer/RWViewer.hpp	0% <0%> (ø)
rwgame/viewer/RWViewerWindows.cpp	0% <0%> (ø)
rwgame/RWImGui.cpp	0% <0%> (ø)	:arrow_up:
rwgame/RWGame.cpp	0% <0%> (ø)	:arrow_up:
rwgame/viewer/RWViewerWindows.hpp	0% <0%> (ø)
rwgame/viewer/RWViewer.cpp	0% <0%> (ø)
rwengine/src/objects/CharacterObject.cpp	13.25% <0%> (ø)	:arrow_up:
... and 18 more

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