Added rectifier interface

Add functionality for setting paths to ext progs in config dialog

Restructured the shortcut configuration tab a little, allowing it to be sorted.

Forgot the icon

Added visibility toggling

Added grouping basics - will be needed for ext programs (Intersector, Isecalc and a lot of others use 2 or more inputs, need to get all of those in somehow...) plus I think they can be useful for the actual authoring process

Further work on ext programs, LDObjectType_e integrated into LDObject

Further ytruder support

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mercurial