- Fixed P_CheckMapData allowed non-map lump names to pass resulting in a crash when actually trying to load the map.
- Fixed: Disable ifitem jumping if a link isn't specified since an invalid value can cause a crash.
Merge branch 'maint'
- added custom automap overlay colors.
- extended am_drawmapback so that map backgrounds can only be drawn if used with custom colorsets and Raven's, assuming that these sets were specifically made for the accompanying backgrounds.
- added 3 more modes for am_cheat: 4-6 are the same as 1-3 with the exception that lines not drawn on the regular automap won't be shown.
- fixed: The sector's 'hidden' UDMF property did not properly clear the corresponding flag if the value was 'false'.
- added UDMF 'waterzone' property for sectors.
Merge branch 'maint' of https://github.com/rheit/zdoom into maint
- added Player.Aircapacity property which is used as a multiplier for the level's air supply.
- added APROP_ViewHeight and APROP_AttackZOffset submission by TheFortuneTeller.
- Ability to set A_VileAttack's initial attack's damage type - by BlueShadow.
Merge branch 'maint'
- added gravity property to UDMF things. Positive values are multiplied with the class's gravity property, negative values are used as their absolute.
- added MF5_NOFORWARDFALL flag to prevent attacks from making its victim fall forward randomly.
- added ML_BLOCKHITSCAN line flag.
Merge branch 'maint'
- fixed: When creating colormaps for 3D floors the model sector's fade value must be used when defining a fog volume.
- added MF6_NOTONAUTOMAP flag to exclude things from being shown with the scanner powerup. The IDDT cheat will not be affected by this.
- added MF6_RELATIVETOFLOOR flag.
Merge branch 'maint'

Conflicts:
	src/am_map.cpp
- let APowerRegeneration use the Strength property to define the amount of regeneration it gives.