Revert "Add an option for shoot preview."

Who wants shoot preview on a pc? And who doesn't on android? I think this is
best solved with an ifdef rather than a whole new option.

This reverts commit 5999791323ee6ca2b3379aa0156a5d2679b15dff.

Conflicts:
	src/Engine/Options.cpp
Don't mark aimed tile.

On android the tile is already highlighted because the shoot cursor ends there
after pressing. Blind commit.
Turn soldier when swiping from it.

I also moved the code to scroll from map to battlescape, for consistency.