Implement more GameClient stuff

[codecov-commenter]

Codecov Report

Attention: 364 lines in your changes are missing coverage. Please review.

Comparison is base (9cec511) 2.58% compared to head (a33e8f9) 2.57%.

Files	Patch %	Lines
src/game/client/gameclient.cpp	0.00%	173 Missing :warning:
src/game/client/gui/imemanager.cpp	0.00%	48 Missing :warning:
src/game/client/system/campaignmanager.cpp	0.00%	44 Missing :warning:
src/game/client/gui/shell/shellmenuscheme.cpp	0.00%	34 Missing :warning:
src/game/client/eva.cpp	0.00%	28 Missing :warning:
src/game/client/gui/headertemplate.cpp	0.00%	18 Missing :warning:
src/platform/w3dengine/client/w3dscene.cpp	0.00%	6 Missing :warning:
src/game/client/videoplayer/videoplayer.cpp	0.00%	5 Missing :warning:
src/game/client/ingameui.cpp	0.00%	1 Missing :warning:
.../game/client/system/particlesystem/particlesys.cpp	0.00%	1 Missing :warning:
... and 6 more

:exclamation: Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #1080 +/- ## =========================================== - Coverage 2.58% 2.57% -0.01% =========================================== Files 941 943 +2 Lines 108476 108838 +362 Branches 18500 18565 +65 =========================================== Hits 2799 2799 - Misses 105273 105635 +362 Partials 404 404 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

[jonwil]

Missing video fixed.

[xezon]

EA Logo video works Sizzle video works Shell menu and map works Keyboard works Eva works Mouse works Drawables shrouded update works String display works Terrain works InGameUI works Header Templates work Campaign works Challenge works Online menus work

IME Manager not tested