Return GameVersion to caller

[Katharsas]

So i basically have not better way to guess which game version i might be dealing with, so i made this change to be able to get ZenKits opinion on this^^

[lmichaelis]

Heyo, thanks for making a PR! I'll let the CI run but it looks good :)

[Katharsas]

CI seems to be broken a bit in general, i don't think it has much to do with my changes^^
Btw. trying to run tests on windows results in

PS C:\Users\Jan\Repositories\Renderer\ZenKit\out\build\x64-Debug> .\test-zenkit.exe
[doctest] doctest version is "2.4.12"
[doctest] run with "--help" for options
===============================================================================
C:\Users\Jan\Repositories\Renderer\ZenKit\tests\TestCutsceneLibrary.cc(39):
TEST SUITE: CutsceneLibrary
TEST CASE:  CutsceneLibrary.load(GOTHIC1)

C:\Users\Jan\Repositories\Renderer\ZenKit\tests\TestCutsceneLibrary.cc(39): ERROR: test case THREW exception: Failed to open ./samples/ou.proprietary.bin

===============================================================================
C:\Users\Jan\Repositories\Renderer\ZenKit\tests\TestCutsceneLibrary.cc(46):
TEST SUITE: CutsceneLibrary
TEST CASE:  CutsceneLibrary.dump(GOTHIC1)

C:\Users\Jan\Repositories\Renderer\ZenKit\tests\TestCutsceneLibrary.cc(46): ERROR: test case THREW exception: Failed to open ./samples/ou.proprietary.bin

===============================================================================
C:\Users\Jan\Repositories\Renderer\ZenKit\tests\TestDaedalusScript.cc(14):
TEST SUITE: DaedalusScript
TEST CASE:  DaedalusScript.load

C:\Users\Jan\Repositories\Renderer\ZenKit\tests\TestDaedalusScript.cc(14): ERROR: test case THREW exception: Failed to open ./samples/menu.proprietary.dat

minkernel\crts\ucrt\src\appcrt\time\wcsftime.cpp(1163) : Assertion failed: false

[lmichaelis]

Yea those failures aren't caused by this change :) Merged.