Add cvar to list weapons to sound on, remove fake client check for hrcbot compatability

Hello:

This request contains the following changes:
 * Add sm_damagesound_actonweapon cvar to specify what weapons to sound on (space delimited)
 * Removes IsFakeClient check so that hrcbot's are acted upon.  
 * Adds IsClientSourceTv checks
 * A typo fix here or there
 * Increment version to 1.6

I have left in commented out PrintToServer(..) statements for debugging purposes.

Thanks

[foo] bar