Add a new Terrain brush action:  Smooth Slope.

This smoothes the terrain using a linear regression algorithm.  Exists alongside the oldstyle height averaging action -- options are good!
Merge pull request #327 from thecelloman/smoothslope

Add a new Terrain brush action:  Smooth Slope.
Remove unused weapon scripts in Full Template
soldiergun.cs
grenadeLauncher.cs
rocketLauncher.cs

These scripts defined functionality that is not implemented for any of the current weapons.
Merge pull request #328 from thecelloman/removeunusedwpnscripts

Remove unused weapon scripts in Full Template
Remove unused and duplicate sounds.
Merge pull request #329 from thecelloman/cleansounds

Remove unused and duplicate sounds.