Handle some TODOs, bugfixes, and compiler warnings.

Signed-off-by: nppangband <nppangbanddev@verizon.net>
rename spells2 as spells_misc

Signed-off-by: nppangband <nppangbanddev@verizon.net>
Add banishment dialog box.

Signed-off-by: nppangband <nppangbanddev@verizon.net>