Bump TTcards version to 0.9.1
Fix user file path issue preventing TTcards from binary distribution

* Implement a temporary workaround for an unexpected conflict of a
generic debug macro used in both TTcards and Apple's official API
header files for determining OS X specific user paths.

* TTCARDS_DATA_DIR is now a proper constant string that is determined
upon execution, and not at build time via cmake. It is a sloppy 'fix',
but will be easy to clean up for other platforms when the time arises.
Merge branch 'hotfix/v0.9.1'