This includes a small bug where the target pane wouldn't automatically update if changes to the sprite occured while in fullscreen/player mode.

Closes #4221

https://github.com/LLK/scratch-gui/pull/4312 had a function name conflict with the existing code. This change fixes that by renaming the conflicting function, and removes redundant code.

Listen to the new project changed event from the VM and keep track of the state in Redux.  Update it as appropriate.

Known issue is that the project is marked as "changed" immediately after it's loaded. This is due to asynchronous event emitting while the project data is loaded, and needs an update to the VM to fix.

responding to canSave without needing canSaveNew prop
removed canSaveNew
added default for onUpdateProjectId
removed conflict files erroneously added
don't pass down onError
got tests passing
better creating and saving logic and names

stripped title handling from sb file uploader
updated more projectState related names
simplified hash-parser-hoc logic slightly

changed componentWillReceiveProps to componentDidUpdate in project-fetcher-hoc and project-metadata-hoc

everything in new project lifecycle works, except when old project was also default one, then it loads new project twice

load new project, both json and title; set title on file load; draft of code to fetch title from api

styling for title field; correct input target in tests; make download filename safer with default, max length; in playground index, correctly pass props through to gui container

Just use ProjectLoaderHOC to translate props to redux. Trying to be clever about using both props and redux state together was... not clever.

Resolves #3040