Also fixes an inadvertent issue where F1 was not opening context help in
the text editor anywhere in Keyman Developer. This means that pressing
F1 while a keyword is highlighted in a .kmn keyboard will not re-open
the context help for that keyword once more (yay!)
Fixes#10458.
Refactors the LDML keyboard test window significantly, in order to be
able to support markers. Cleans up the state machine for the debug
window in the process, as that was complicating the changes. Removes
a lot of extraneous code in the debug window.
Fixes#10420.
Implements a basic LDML keyboard test window. Press F5 or Keyboard/Test
to start test. Shows a character grid for each character in the text.
Does not yet support display of markers (#10458). Does not support
interactive debugging, nor any more detailed status information.
Adds XmlLdml keyboard editor form based on the plain text Editor for
now.
ActiveEditor is a name used for multiple purposes. Rename to
ActiveKmnKeyboardEditor and introduce ActiveLdmlKeyboardEditor
alongside.
