scratch-gui exports `index.js` instead of just GUI container.

Since compatibility-testing got switched to use the player mode, it doesn’t need any of the stage/controls components.

* Export initial states for each reducer
* combine all gui reducers (excludes scratchPaint and intl)
* combine all initial states to create default guiState for preloading in www
* expect all of the gui state to be accessible at `state.scratchGui`

GUI will export a reducer to be included in the enclosing component’s redux when GUI is used as a library. The app-state-hoc is moved into the playground examples to provide a store when GUI is being used stand-alone.

Pull in optional quirks mode changes

chore(package): update scratch-paint to version 0.2.0-prerelease.2018…

Closes #1949

Fix several minor monitor issues from recent testing

Hide field editors when a modal is shown

Smoke test branch -> Develop

Update scratch-paint to hide font dropdown

This is temporary for the release to master

Publish develop builds to NPM

Update scratch paint

Add missing vector sprites and costumes to libraries

Update scratch-blocks (flyout bottom padding)

Fix monitor scaling, positioning and draggability in fullscreen mode

Specifically in 2.0:
- Monitors cannot be dragged in fullscreen/player
- List monitors cannot be resized, have items added using the button or have their values edited.
- Slider monitors still work.

Don’t load null project id

Replace white rectangle bitmap with empty svg for default backdrop

Only call updateProject to load the project if there is a project id, or it’s the default project id.