Changeling DNA points/absorded humans indicates borked.

[Marquesas]

These will be addressed in my next commit.

Changes:
- Reducing DNA sting cost to 4 DNA points.
- Adding accurate 'absorbed DNA' display to Changeling tab.
- Removing old data from status tab.
- Reintroducing the ability to use self-affecting abilities (regenerations, all transformations, mimic voice) in containers
- Fixing own DNA.
- Making changeling disease immune again.

I think that's everything addressed right?