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)

cleanup

Plane drawing is functional at last!!!11 Also added meta function findAction to find an action by name so I don't have to extern all of them manually in gui.cpp

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mercurial