Android migrate folders

Fix text insert when dn < 0

Display blank subkey if no text is given

I suspect this portion of the code is obsolete, but fixed the old `/languages` and `/fonts` structure in this method.

Add header to `FileDownloader.download` to clarify that it will create destination directories if they don't exist.
Also fix 1 more place for storing packageID when downloading ad-hoc keyboard

Lift some constants out of Manager

KMKEyboardPickerAdapter.onClick needs a defined packageID to display the keyboard version

More refactoring + formatting cleanup

For undefined packageIDs, update keyboardsList and save.

Use `KMManager.KMDefault_PackageID` if the `keyboardID` is `KMManager.KMDefault_KeyboardID`

At the moment, the keboard API isn't publishing the packageID, so using "cloud" as an in-term packageID.

As a result, keyboards get downloaded to /packages/cloud/

Quote packageID for JS call. And assign undefined packageID to `cloud`

By design, kmp keyboards will unzip into /packages/packageID folders. 

1. Moving default eurolatin2 keyboard assets
2. Move old keyboards to new packages structure

Keystroke processing engine refactoring

Use the correct delegate variable name

Move KMW WebView interaction into view controller

re-parent and update delegates if they are lost during keyboard initi…

Remove unused subkey notifications