Fixes#4807.
We want to differentiate between a short copyright message and a
longer one that also contains a date. The long one is only needed in
one place in a typical keyboard project. This reduces maintenance when
making keyboard updates.
Fixes#2657.
Importing a Windows Keyboard had an option to select default targets for
the imported keyboard, but the option was ignored. This propagates the
option setting through the import process.
