Rework JoinLineBelow logic slightly to insert a space when joining lines
Rework JoinLineBelow logic slightly to insert a space when joining lines

This is more useful and consistent with the built in `join_lines` functionality.
This also fixes a bug in the suggested keybindings that would cause HTML/XML comments to have an asterisk inserted for them, when it should really only be relevant for comment blocks that start with `/*`
STealthy-and-haSTy/SublimeScraps,STealthy-and-haSTy/SublimeScraps