[Open Assets] Propeller Box v1.1.6

- Tried to fix the c1 launch being buggy when carrying a pbox - but instead, it's stopped functioning entirely (unless you're ALSO a pbox - weird...)
- Figured that this is better than it breaking so here we are.

Fixed a couple bugs:
- He can now use shield abilities underwater
- Holding spin and jump while on the ground won't make you hover on the ground constantly

New move: Pressing c1 while not moving boosts him off the ground!
- This is mostly to fix the fact that he got stuck in FHZ's snow completely if he landed in it

Big thanks to Kobolds on Discord for finding these!

Fixed a bug where if you were holding a box and changed levels, that particular box wouldn't be able to be picked up again afterwards.
It had to do with that check for if a box is already being carried that I added earlier.

This is also the source of that Special Stage bug from before.
:P

Added a check for if you happen to change characters while being held - even though that shouldn't be possible since you aren't on the ground...
All I know is that I managed it once during testing and it was very funny.
Should've recorded a gif...

Added a check for if a box's already being held - hopefully that'll work.
That, and you can't pick up a box in an MP Special Stage - not sure why that is...

You can bust floors and walls while carrying him now :]

Added a whole lot of fixes, and the ability to pick him up in multiplayer! :]