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

Added autosaving of the current map. Autosaving happens in intervals when the map is changed. It will not overwrite the current map, but rather create new files, just like backups. Autosaving interval and number of files can be configured in the "Recovery" tab of the preferences. Autosaving can also be disabled there (not recommended). Autosaves will not have their nodes built for performance reason.

Script Editor: fixed a crash when the find/replace dialog was opened and the previously selected script tabs do not exist anymore. Fixes #993

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

Script Editor: pressing enter in the search box now performs the search. Pressing enter in the search box of the replace tab performs a search. Pressing enter in the replace box of the replace tab now performs a replacement. Pressing the Escape key now closes the dialog. Fixes #972

Edit Linedef dialog (UDMF): fixed a problem where the back sidedef's controls were not disabled correctly if their UDMF fields were not set in the game configuration

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

- fixed an issue where undo snapshots were not created correctly when editing a sidedef's custom UDMF fields. Fixes #920
- fixed an issue where closing the back sidedef's custom UDMF field editing dialog would close the linedef dialog