Blender Git Loki

Keymap: disable 'repeat' by default for keymap items

In practice, there are only a limited number of operations we need to
use repeat such as navigation, stepping operations that cycle states
and text input.

Now we don't need to disable repeat explicitly when a modal operator
uses checks for a key being held as was needed for 17cb2a6da0c88.

Repeat is now included in exported keymaps.

Use versioning so existing exported keymaps are loaded properly.