Adds HookMatcher and HookMatch classes.

The hook matcher takes a line and current word and identifies if the
that line matches a hook. Returns the kind of the hook. Kind can be
action, alistener, etc.
Adds get_current_line helper.
Adds hooks pattern.
Adds HookMatcher and HookMatch objects to controller
Improves jump to core for WordPress hooks.

* When cursor is on the action in add_action
  * <c-]> will jump to the invocation of the action/filter
* When on do_action
  * <c-]> will jump to the add_action and populate the tag stack.
* Similar jumps for apply_filters and add_filter
Adds documentation for the improved Jump to Core.
Merges branch 'feature/improve-jump-to-core-for-hooks' into develop