LLabel: fixed: createEditorComponent parent call
LLabel: labelTextChange callback is optional
lua/LRectanged: fixed :removeFrommBottom
minor changes
Created (and registered) LJComponent as a native component and set MainComponent as a DragAndDropContainer, so there's only one DNDContainer, at top level, but also so there's at least one
added: LSourceDetails
LTreeView/LTreeViewItem: implemented dnd
fixed: missing LJComponent_inh.h
LuaO: added returnTable<SparseSet>/getSparseSet
added LListBox (untested)