Don't prompt again for plugins when downloading a map
Simplified plugin prompts
Added comments for clarification; fixed ds_list_destroy() call
Elegance, and now it remembers plugins being skipped after 2nd map
Merge pull request #198 from TazeTSchnitzel/serverplugins

Server-sent plugin improvements
Rename Contributing.txt to Contributing.md
Merge pull request #206 from arctic5/contributing

Rename Contributing.txt to Contributing.md
Fix arena div0 bug
Fix realnumflames runtime error

- Declare realnumflames in create
- Make sure it and other calculated-in-draw variable updates aren't
  skipped if hosting
Make draw not affect state
Fix various delta time errors and update 2.6s to 2.7s
fix stupid constants mistake
Put projectile and gore movement into with()s
Fix projectiles "coming out" backwardser in 60FPS

Bullets were coming out behind where they should have been coming out
because of the way that movement compensation works. Actually, it's not
because of compensation directly, but because the 30fps movement happened
after the bullets were spawned, before collisions etc, because they're
spawed in a begin step, and then they're newer instances than the one that
ran its begin step, so their begin step ends up running in the same frame.
So the bullets should always move a 30fps movement on their first frame
because that's the practical.

I think this is a better solution than moving bullets in the functions
that spawn them while making it so that they don't run their begin step
the first time.
This should fix passively visible stabs
Add explanation of the variables in RateController
fix formatting
Run plugins in their own little environments
Further fix formatting
Fix killcam closing 60fps