Add support to Get/SetEntPropEnt for FIELD_CLASSPTR and FIELD_CLASSPTR datadesc fields.
Fix Dota 2 build.
Remove unnecessary null check.
Merge pull request #83 from alliedmodders/more-prop-data-types

Add support to Get/SetEntPropEnt for FIELD_CLASSPTR and FIELD_EDICT datadesc fields (r=KyleS).