Show alternate logo if GUI is initialized with a different file.

Show or hide the language and file menus.

- Create the scratch renderer earlier in the GUI container/HOC stack
- Delay loading and rendering GUI component until after project assets
  have been fetched

Discovered this while trying to pass other props to the stage wrapper, we were not passing isRTL to the stage wrapper, causing ask/answer bubble to not display the right direction.

The playground now displays this on startup when in Scratch Desktop
simulation mode.

Toward LLK/scratch-www#2296

This allows us to take you to any destination when clicking the logo, or to do something else, or nothing at all.

If no handler is provided, the logo will not be clickable.

use blue creating screen for new projects; revised alert text for copy, remix; saving messages don't dismiss alerts

Fixes 2 related issues:
1. The stage shrinking to 85% based on responsive stylings, which shouldn't happen when embedded in player only
2. When you click "small stage mode" in the editor then switch back to the project page view, it shouldn't show with small stage mode.

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.

Fix by disabling overflow scrolling when a modal is open (this prevents the scrolling input issue) and reducing the top margin on custom procedures because it is a taller modal than most

made remixing, saving as copy states; made project state naming more consistent

changed meaning of canCreateNew to true creation

fixed project-saver-hoc test

removed Remix option from standalone player menu; renamed canSaveAsCopy to canCreateCopy

added parenthesis missing from rebase

fixed create new test

* 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

don't set redux project title directly from sb uploader; only extract title from .sb2 and .sb3 filenames