Errors detected while attempting to play d3bfg as a submod of OTE

[BielBdeLuna]

d3BFG is at the moment to only game that should be playable in the OTE but ATM it isn't playable as a mod of it. making it playable as a mod should allow us to detect errors in the engine that should be sorted out.

1 - mod files aren't yet priority over files packed in *.resources files:
Making fs_resourceLoadPriority default as 0 should allow modding in case of having *.resources files in the mod folder. I made a PR in order to solve this.

2 - *.resources files or any other mod files in the mod directory should be prioritized over any file in the base directory:
When using fs_resourceLoadPriority as 0 *.resources files in a mod directory become the least priority posible even having files in the base directory having further priority than them.

I think this should be the priorities:

1st priority ) common files in the fs_game directory
2nd priority ) *.resource files in the fs_game directory
3rd priority ) common files in the fs_game_base directory
4th priority ) *.resources files in the fs_game_base directory
5th priority ) common files in the base directory
6th priority ) *.resources files in the base directory

3- sound devices doesn't seem to be well detected by openAL, there is no sound and launching s_restart end up with error messages.