Action Channels can now be collapsed/expanded to show/hide Constraint Channels, lessening clutter. In future, this could (will probably be) expanded to
show the show/hide individual transform channels.
User Notes:
* Expansion is off by default
* NKEY popup now features option to turn expansion on/off
* Changed behaviour of protection a bit - now if an action channel has protection
on, constraint channels under it are also automagically protected
Developer Notes:
* I've gone through doing a lot of whitespace/linebreak tweaking to get the code looking more consistent with itself
* To save typing (and to make it easier to make future revisions), a set of macros
is now used to check for some commonly-checked settings (i.e. selection, visibility,
and protection).
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