1) Implement new survey validation logic.
2) Allow multichoice questions to be unselected.
3) Use proper default min/max selections values when absent.
1) Refactor and rename to remove "dialog" from survey files.
2) Remove old unused drawables, layouts, and colors.
Fix corners of invalid surveys so background doesn't show through.
Rename some more drawables to remove "dialog".
Fix optional survey validation, and send button validation.