Fix up some Android debug messages.

Enable two that weren't enabled properly that are relevant; remove
several that are no longer relevant.
Map the back button on Android to ESC.

... since that's the closest equivalent key here.

TODO: get it to save and quit on the main screen, or prompt for it?
Android: only show keyboard when text input is needed.

TODO: add a button into the command area to show it on demand; also
figure out other cases when it might be needed (like at the main menu,
but in the short term players can restart the game if needed).

A short term workaround is to use the stash search button, which pulls
up the keyboard because it needs text input.
Calls to wm->show_keyboard depend on TOUCH_UI, not __ANDROID__.

In case we ever need to do this for non-Android touchscreen devices.

In the event that we undefine TOUCH_UI while on Android, the keyboard
once again pops up on init.
Properly generate dat/tiles/*.png from rltiles on install-data.
Add a button to show the keyboard on touch UIs.

Complete with Grunt tile, which probably should be replaced.
Properly #ifdef out a bit of tile selection code.

Thanks travis!