Changes

PositionChecks.c: Refactor small functions

- `inline`d small functions
- removed unnecessary if() statements
- added nan checks using asserts
 (commit: 7e8999d)

Server: Check for invalid floats in all packets

This adds checks for nan/inf in all instances where a float is read
from a packet, and drops it if an invalid value is found.

The vector3f_t check is located in a new file, VectorChecks.c.

Credits to burner (DavidCo113 <[email protected]>) for telling me about this.
 (commit: 4b03847)