Form improvements

Changed the flavor text on power over to a text area, and made several text areas auto-expand.

**Testing**

* [x] Make sure that powers can still be entered.
* [x] Ensure Section text areas auto-expand without causing issues.
* [x] Ensure Flavor text areas auto-expand without causing issues.
* [x] Ensure Feat Description text areas auto-expand without causing issues.
* [x] Ensure Class Description text areas auto-expand without causing issues.