BUILD: Edits to build configuration, moved maps out of PAK files

[Zungrysoft]

Description of Changes

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• Moved deathmatch maps out of PAK files in order to make setting up servers easier and allow players to delete/move conflicting bsp files.
• Made build script not give a 'missing asset' warning for .lit files, since some of our maps don't have an associated .lit file.
• Moved the engine-specific default.cfg files into PAK0.PAK to be with the regular default.cfg. We don't want the user editing these files anyway.

Checklist

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• I have read the LibreQuake contribution guidelines
• I have thoroughly tested my changes to the best of my ability
• I confirm I have not contributed anything that would impact LibreQuake's licensing and usage
• This Pull Request fixes a critical issue that should be reviewed and merged as soon as possible

[lavenderdotpet]

looks good to me

[lavenderdotpet]

slight suggestion to the name of the pull request
not going to make it a request change since its not to important

id just suggest changing the title
to something that says that the maps are being moved

[lavenderdotpet]

looks good just needs a 2nd approvals

after this we should talk about moving the gpl assets to one of the 2 paks again
it's better to keep them separate
so maybe pop.lmp and progs.dat in pak0 and everything else in pak1

[Nolcoz]

Is good