Switch all text layout to Minikin

This patch switches all text layout operations to use Minikin, removes
the USE_MINIKIN #ifdef, and deletes some of the code that was only used
in the old TextLayout path (although some more refactoring remains).

Change-Id: I51b5c4e2bb46cfd9d204c12b9f16f135c769f5b5
13 files changed