Blender Git Loki

Keymap I/O: Add "exec" versions of import/export

The new "exec" functions are added for the sake of the VR Scene
Inspection add-on and do not affect the behavior of the existing
keymap I/O functions.

keyconfig_export_as_data_exec() enables exporting a specified keymap
instead of all user-modified keymaps. The VR add-on uses this to
selectively export the "XR Session" add-on keymap.

keyconfig_import_as_data_exec() enables adding keymap data to an
existing keyconfig instead of creating a new keyconfig. The VR add-on
uses this to add the "XR Session" keymap to the add-on keyconfig.