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

add missing license headers from new files

Begin work on external program support (Ytruder partially supported)

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mercurial