This allows finer grained control of crashsite, carepackage and infected
camp spawn positions and radii (further north, south, east, west, etc.).
Also removed some hardcoded checks for Chernarus, since
dayz_townGenerator should always be off on other maps for now. Someone
may add town generator coordinates for other maps later.
Related vanilla commits:
b20b402bf07c8b69eb827dfd3ef9cf
Junk and plant spawning is disabled by default. It can be enabled via
dayz_townGenerator config variable and positions blacklist (for trader
cities, etc.).
The trader objects spawn code was consolidated to functions.
