Display blank subkey if no text is given

Lift some constants out of Manager

More refactoring + formatting cleanup

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

[Web] Fix for subkey '(layer-default)' behavior.

Do not use remote filename to set local filename

Ensure that Developer respects the Keyman version that the user has set for the keyboard

Update Xcode project files

Ignore zero-byte JS keyboard files

For the 3rd part of #370, ignore 0-byte JS files in `KMManager.getLatestKeyboardFileVersion)`

If a keyboard doesn't have a valid version, attempting to load it will revert to the default (EuroLatin2) keyboard.

Also added a check so null version keyboard doesn't get added to OldKeyboardsList

Rename references to tavultesoft.keymanweb in KeymanWeb compiler and debugger

Update HttpURLConnections to follow HTTPS redirects

Check valid file size when downloading keyboard