- Splitting the pull request in half.
- Added THRUREFLECT, MIRRORREFLECT, and AIMREFLECT. All require REFLECTIVE to work.
- THRUREFLECT prevents missiles from changing course if reflected, and takes precedence over all reflective flags.
- MIRRORREFLECT causes missiles to perform a direct 180 turn-around.
- AIMREFLECT turns the missile back to the original shooter, and does not slow the missile down.
- Added three missile impact pointer changing flags.
- HITTARGET, HITMASTER, and HITTRACER.
- A missile that dies hitting an actor will set this impacted actor as the new target/master/tracer, depending on specifications.
Added cl_waitforsave

- cl_waitforsave (default true) pauses the game timer when a save
starts, preventing the network buffer from trying to compensate for slow
saves.
Merge branch 'hitpointer2' of https://github.com/MajorCooke/zdoom

Conflicts:
	src/actor.h
	src/thingdef/thingdef_data.cpp
Merge branch 'waitforsave' of https://github.com/Edward850/zdoom