simplified autosave code per rschamp's comments; made isShowingSaveable and autosaveIntervalSecs props

I do not like how the alert component is hyper specialized for two distinct use cases. It would be much better to refactor the alerts so that the alerter can just fill the alert with whatever they want. But I do not feel comfortable making that refactor because I know ben and evelyn have gone back and forth about these alerts.

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.

Instead of saving .sb3 files to the projects server, save just the project JSON. Save assets to the assets server. This happens via the asset types being routed to different web sources by storage.

made alert messages translation-ready
updated project saver hoc
default alerts to COLOR_ORANGE

got tests working

made neutral button color

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

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