Spawn locations from configuration files

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Overall description of the new feature:
It is pretty hard to change spawn locations once map is built.
So just with case of location determination we may have the same to create 
overridden spawn locations.
For each map we may create an separate configuration file with locations. 
These locations could be set in developer mode and stored in config file.

This way we may alternate default spawn spots to make some other modes as 
well as balance maps without rebuilding them.

Variables to control the new feature:
cmd set_spawn_point <type>?
cmd remove_spawn_point <num>?
cmd list_spawn_points?
cg_draw_spawn_points?

Original issue reported on code.google.com by igorpana...@gmail.com on 10 Nov 2009 at 8:17

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Once we succeed with it - we may have configurable escape zones, items, 
weapons, etc.

Original comment by igorpana...@gmail.com on 12 Nov 2009 at 6:38