Fixed: changing brightness of upper/lower/middle sidedef did not update the whole sidedef brightness until 3D mode restart

Added dynamic light count = 256 for high end users. Fixed: incorrect attenuated<->subtractive light ordering caused invisible subtractive lights.

Added: primitive support for ZScript in the script editor (all classes in the current file are listed)

Added: basic support for automatic user variables from ZScript classes, currently only for int variables (as supported by GZDoom).

Reverted anotak's PR: it causes 'Cancel' button in Edit windows to automatically do undo or something similar, breaking maps completely

Fixed: links should now open in the default browser and not what GZDB thinks to be the default browser.
Fixed: ZScript parser should no more crash on severely invalid code.

Added: more magic to the autoalign/select neighbours logic; These functions should not anymore wrap around to the opposite side of two-sided linedefs, allowing you to select back and front sides separately using shift+click, and reducing infinite broken autoalign loops.

Fixed: long texture names are no longer activated for Doom flat images (GZDoom doesn't support these)

Fixed: lump saving in script editor after editing archive with SLADE.\n Fixed: checking for concurrent modification in script editor while trying to save the lump.

Fixed: ZScript: scale property should be expanded into xscale and yscale; Fixed: if actor's Spawn state starts with TNT1, first non-TNT1 frame will be used

ZScript: fixed odd cases of inheritance (class SpecialShotgun : Shotgun replaces Shotgun) causing stack overflow

ZScript: moved actor inheritance code to separate step; ZScript: ported game configuration inheritance code from DECORATE