Palisade: add double-resolution cursor mode.

This adds a "half-grid" cursor mode, settable via a preference, which
doubles the resolution of the keyboard cursor, so that it can be over a
square center, vertex, or edge. The cursor select buttons then toggle the
edge directly under the cursor.

There are two advantages to this new behavior. First, the game can now be
played with only the cursor keys, doing away with the need to hold Control
or Shift, which are not currently emulated on Rockbox. And second, the new
interface is arguably more discoverable than the legacy mode,
which is still retained as a user preference.

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