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.

Disable cloud variable option when vm reaches limit for project. Rename canUseCloud to match other property in the prompt container/component.

Move cloud connection logic into its own HOC and add canUseCloud flag to control whether to show the new cloud variable options in the variable modal.

The function is being changed to resolve to a promise, so do not request a workspace refresh until after the sharing is completed.

* Connection Modal loads its own data

* Connection does not update flyout status buttons

* WIP moving connection modal into redux

* Lint fix and remove unused prop

* Close modal even if exception on disconnect

* Handle recordSoundCallback from blocks

* Set custom field type for sounds menu

* Add record… item to sounds menu

* Use localized string and ID for ‘record…’ option

* Add integration test

* Don’t use custom field for sounds menu

* Use callback as the value of the ‘record…’ menu item

Workspace update errors can be partially recovered from. This allows
the gui to "successfully" load on projects that pass vm validation and
loading but throw an error in scratch-blocks. Logging the error instead
of throwing it allows the gui and vm to finish updating for the
workspace change. This allows the VM to behave normally even if the
scratch-blocks workspace rendering is incomplete.

Call updateToolbox whenever the blocks container updates and is visible so that changes to dynamic menus (e.g. costume renaming) are picked up. Update setLocale to call updateToolbox so that the toolboxRefresh gets re-enabled. This is needed for getting translated toolbox strings like 'Hello' and 'Hmmm...' to stay in sync with language changes.

Remove cruft and add comments to explain how setLocale is called.

In `blocks.jsx` only call setLocale if visible. Depends on `getLocale` being added to VM to know when global locale changed while not visible making the VM out of sync.

Fix rename variable bug by always passing additionalVars to the scratch-blocks prompt callback. Let scratch-blocks decide whether or not to use the additional vars based on whether the variable is local or global.

Depends on https://github.com/LLK/scratch-vm/pull/1321

Allow specifying variables as local vs. global. Pass var names from VM to scratch-blocks for checking for conflicts in all sprites when attempting to create a global var.

* updated locales reducer to include current messages and messagesByLocale (the previous all messages)
* moved locales out of gui
* include locales in the things exported by gui (index.js)

Add `?locale=<localecode>` to load in a new langage.
Add `?enable=language` to enable the language selector
Or combine the two: `?enable=language&locale=<localecode>`
Still accepts a hash, but requires that the hash be a sequence of digits.

Added new locales reducer to gui:
- initializes default  react-intl/localeData
- initializes default locale messages for all locales
- default locale is ‘en’ (can be overridden by URL)

Removed dependency on react-intl-redux, added ConnectedIntlProvider (uses correct locale messages from redux based on current locale)