More Changes to Monoliths

* Fixed issue with Monoliths detecting players through walls
* Changed aggro values from bytes to shorts
* Fixed aggro updates so that aggro levels can decrease
* Fixed upper bound on aggro clamping
* Added client/server-side checks to a few functions to save on
performing pointless checks, such as making calculations for spawning
particles on the server
Merge pull request #160 from SenseiKiwi/master

More Changes to Monoliths