common: Copy aglRes-Files from WiiU-Decomp

[MonsterDruide1]

Due to the amount of stuff needed to get properly defined classes in #13, this has been moved to a separate PR.

This Pull Request mainly copies the files from https://github.com/aboood40091/sead/tree/master/packages/agl/include/common required to add ResShaderArchive and ResShaderBinaryArchive, with minimal changes (formatting to align with our custom guidelines).

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This change is 

[aboood40091]

IIRC the format changed slightly since NSMBU. You might want to double-check if there are any differences.

[ThePixelGamer]

I probably missed some things but some more research needs to be done

[leoetlino]

The assertions can be uncommented - you might need to include sead's assert header first though.

[MonsterDruide1]

IIRC the format changed slightly since NSMBU. You might want to double-check if there are any differences.

What files/classes can be looked at here? Searching for agl::Res only gives some Shader-related classes, but it's missing a huge chunk.

[leoetlino]

LGTM other than that, thanks for porting these changes over!

[aboood40091]

Just need @leoetlino's approval of the non-matching functions in aglResShaderArchive.cpp, the reason for their inclusion being:
#15 (comment)
If he doesn't reply in the upcoming few days, we can merge this ig.

[MonsterDruide1]

No response yet, so should we merge without approval, or wait for longer?

[leoetlino]

lgtm (other than some modernisation nits, e.g. xxxxx::iterator could be replaced with auto), sorry for the late review