* 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
* Instances -> Table
* instances.rs -> table.rs
* Rename occurrances of the word "instances"
* .instance -> .element
* Instance* -> TableRow*
* Rename Table and TableRow methods to not say "instance"
* Remove presumed unused serde defaults now that tables default to length 0 not 1
* Rename occurences of the word "instance"
* Un-alias the RasterDataTable<Storage>, VectorDataTable, GraphicGroupTable, ArtboardGroupTable typedefs
* Move artboard type and node code out of graphic_element.rs to a new artboard.rs
* Organize the TaggedValues
* Fix tests
* Fix prior regression with Image Value node not upgrading
* Fix unit usages
* Add node and parameter doc comments
* Fix the parameters panel for the 'Line' node when added from the graph
* Clean up nodes
* Fix tests
* Update the demo artwork
