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

Fixed null reference access while searching for superclass state; Fixed incorrect parsing of random() in frame duration; Fixed incorrect parsing of quoted sprite names

Internal: started implementing ZScript parser. Nothing works for now, aside from the actual parsing code.

fixed: Texture Select: visible items were not clipped correctly;
fixed: 128x128 texture previews were too large for small window size in Texture Set editor