Slightly tweak ^ screen text display

Align god title and favour better and more tightly, move the blank line
separating the two before to before the section.
Remove the additional centered "Religion" heading that was a bit
distracting, display it in the upper left corner instead if applicable.
Overall, cycling through the three modes on ^ should feel more smooth now.
Make mpr() take a string.

So that c_str() isn't necessary; const char* are automatically cast
up, so the interface for using it should remain the same.
Eradicate an ugly paradigm.
Replace 'mprf("%s", x.c_str())' with 'mpr(x)'.