Shorter cli commands (xelatihy#1302)

Updated docs (xelatihy#1280)

Fixed linking issues in ImGui

Merge pull request xelatihy#1216 from xelatihy/v4-wip

Version 4

Removed unused file.

Fix GLFW build

Bugfix in gui dialog (xelatihy#1013)

Bug fixes (xelatihy#997)

Heightfield to mesh conversion (xelatihy#890)

Io uses exceptions like the standard library. (xelatihy#751)