Restore back Quake 1 and Quake 2 maps support

[Warfork]

Quake 1 and Quake 2 map support should be reintroduced into Warfork for Steam Workshop support. After briefly browsing the Qfusion commit log it seems that this functionality was dropped and reintroduced in the past.

Some relevant commits from the Commit log (https://github.com/qfusion/qfusion):

1. Add a safety measure when loading Quake .pak files
   viciious committed on Jul 11, 2019
   Qfusion@66ecb52

2. Fix Mod_Q1FixUpMiptexShader not working in single-threaded mode
   viciious committed on Aug 13, 2018
   Qfusion@a29f562

3. Restore back Q1 and Q2 maps support
   viciious committed on Aug 13, 2018
   Qfusion@8a9816d

4. Drop support for q1 and q2 BSP formats
   viciious committed on Jun 18, 2017
   Qfusion@5d9a38a

[Warfork]

A reported issue Qfusion#446 should be investigated.