Home button resamples image. Closes #103
Fix file drag+drop
Merge pull request #269 from ChrisBeaumont/data_drop

Fix file drag+drop
Merge pull request #263 from ChrisBeaumont/resample-on-home

Home button resamples image. Closes #103
Refresh parsed component code.

Closes #268
Merge pull request #271 from ChrisBeaumont/parsed_component

Update to Parsed Components
Yield-able state loaders to handle circular imports
Refactor SubsetState to remove parent reference
Refator DataCollection to instantiate the hub everyone is to use
Move Pointer class
Implement Subset Groups
Subset Group Style overriding logic
Pull up property
New M/V implementation of Data Collection View
Make DataCollectionModel read-only, but auto-synced with underlying Data
Integrate DataCollectionModel into gui. UNFINISHED
Update LayerTreeWidget and EditSubsetMode for SubsetGroups.
UI tweaks to handle SubsetGroups gracefully
Tweak how style changes behave and are presented in UI
Remove old data_collection_view