GZDoom Game Configuration: fixed UDMF fields related to ZDRay. Fixes #1043. Fixes #1044.

GZDoom game configuration: removed support for path nodes, because the feature was removed from GZDoom

UDBScript: Added scripts for PathNode management

UDBScript examples: fixed a problem in the "Create Line Portal" script where not all arguments of the selected lines were reset. Fixes #1026

- Add two new example scripts, remove one useless example script

- Add action 6: "Sector Set Portal"
- Fix flags for wind/current (action 541) not showing up

- Show mobjscale by default in Custom tab of things, for convenience
- Officially enable texture scaling (NOTE: only works in 2.2.14 nightly builds)

- Prevent from showing up in Custom tab
- Make sure their sectors are updated upon value changes

Fixed a problem where portal render style could not be set for the Eternity Engine game configuration

Visual Mode: added support for GZDoom style texture skewing

Eternity Engine Game Configuration: fixed an issue where UDMF sector properties were not labeled as unmanaged

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