* ModeChange hooks that remove indent now belong to *-trim-indent groups, instead of just -indent
* *-filter-around-selections hooks and commands have been renamed to trim-indent for clarity
That means we can now have highlighters active at global, buffer, and
window scope. The add-highlighter and remove-highlighter syntax changed
to take the parent path (scope/group/...) as a mandatory argument,
superseeding the previous -group switch.
