Serve all Keyman Configuration dialogs over a local http server
instead of over file protocol. This is more secure and allows for
a bunch of things in the future, including simple online integration
and stable reporting.
Fixes#2630.
The MIME type for .js was being read from the registry, which on some
systems has been corrupted to text/plain, which causes Chrome to abort
loading the script. The fix is to avoid loading the system registered
MIME types, which we don't need anyway, because all the MIME types we
are using are in the default hard-coded list.
Fixes#2402. This adds a menu to switch models in the web debugger.
It is likely that most users will have only a single model loaded but
we need this to complete the circle. It also gives a little more
visibility in the model debugging process to validate that you are
testing the expected model.
