Fixed crash on saving a newly created archive-less map
Grid size can now be changed at any time
Add numpad enter as a default key for accept
Updated event names.

Replaced the old wxEVT_COMMAND_SOMETHING_VERBED by the new
wxEVT_SOMETHING, more concise and less deprecated.

Also added enter support for texture editor spin controls.

However, it doesn't work for spin double controls (like scale and patch
alpha/tint amount). This is a wxWidget bug.
Map images can now be made proportional

If the given dimensions (map_image_width and map_image_height CVARs) are
negative, their absolute are used as dividers for the image size, using
one pixel per mapunit at the maximum.
Merge pull request #82 from Gaerzi/master

Sync with my fork.
Updated ZDoom languages.
Stop startpage from opening itself as an archive

For real this time. This is done by making sure the paths to the archive
to be opened and the path to the startpage are in the same format.
Fixed typo in ZDoom languages.
Added stripped-down ZDoom MIDI conversion setup

This finally allows to play back HMI, HMP, and XMI songs.
Removed unused baggage from new MIDI readers
Removed more needless baggage.
Added TGA, TIFF, and PCX to potential patches.

It's supported by ZDoom and TGA patches are used in the Wolf3D TC.
Fixed some minor warnings/potential problems picked up by VS code analysis
Limit MIDI loops
Fixed problem with undo of architecture merge (gotta be more careful with argument names overriding class variable names >_>)
Merge branch 'master' of https://github.com/sirjuddington/SLADE.git
Merge branch 'master' of https://github.com/sirjuddington/SLADE
Merge pull request #83 from Gaerzi/master

Sync with my fork.
Fixed more undo/redo problems in the map editor