Game Configurations: added UDMF game configuration for EDGE-Classic (provided by Lobo)

Added ability to enable/disable controls in the UDMF map element editing dialogs based on UDMF fields specified in the game configurations (#953)

Game Configurations: added support for enabling or disabling support for vertex heights in UDMF game configurations

GZDoom Game Configuration: fixed lightmap thing arguments for pulsing, flickering, and randomly flickering lights

Game configurations: renamed lightmap things from static to lightmap. Added pulsing, flickering, and random flickering lightmap things

EDGE Classic Game Configuration: fixed a problem with lighting effects in the generalized sector options. Fixes #875

Reverted change that added lighting effects to the generalized sector effects. The lighting effects can actually be set through the regular effects, so it's not needed in the generalized effects tab

Disabled visual sloping for game configurations that do not support plane equation slopes. Fixes #828
Added toasts for visual sloping events

3D Floor Mode: added support for UDMF game configurations without support for sectors with multiple tags (i.e. Zandronum)

Boom game configuration: added missing lighting effects to the generalized sector specials. Fixes #799

Right-clicking the angle wheel in the thing editing dialog will not clamp to 45° angles in binary map format game configurations anymore. Fixes #788

Doom/Heretic/Strife Game Configurations: fixed an issue where the descriptions for the sector effects 2/3 and 12/13 were flipped. Fixes #772

Added explicit warning if gzdoom.pk3 is not loaded for GZDoom game configurations.

Fixed tokenizer not picking up the very last token in the stream.

- Removed surface lights
- Move ZDRayInfo stuff back to UDMF keys
- Add per-surface sampling distance UDMF keys to lines and sectors
- Standardize and finalize the naming conventions for the new UDMF keys to everything lightmap-related to use an "lm_" prefix

Eternity Engine game configuration: clarified description of the "impact" UDMF linedef flag
Eternity Engine game configuration: added missing "monstershoot" UDMF linedef flag

MBF21 Game Configuration: Added missing "friendly" flag to things (thanks to hawkwind3). Resolves #703
MBF21 Game Configuration is now enabled by default

GZDoom game configuration: added support for distinct upper/middle/lower sidedef brightness levels. Resolves #694

GZDoom game configuration: added enum list for the automapstyle UDMF linedef field

Eternity Engine game configuration: removed the lightfloorabsolute and lightceilingabsolute fields from the sector flags, so that they are handled correctly. Fixes #670