* Rename VectorData to Vector
* Rename other VectorData* types to Vector*
* Move assorted data types out of vector_data.rs into misc.rs
* Rename vector_data.rs to vector_types.rs and remove the vector_types module folder
* Rename other references to "vector data"
* Remove label widgets for raster/vector/group to use "-" instead
* Rename RasterData to Raster
* Rename GraphicGroup to Group
* Fix migrations and rename graphic_element.rs -> graphic.rs
* Rename TaggedValue::ArtboardGroup -> TaggedValue::Artboard
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