Move liblouis to subdirectory to make room for the xcode project.
Add Xcode project.
Add autogenerated files:
  liblouis/config.h
  liblouis/liblouis.h
  tests/resolve_table.h.
Note that these files are autogenerated when 'configure' is run, and are ignored by git in the master liblouis repo. However, liblouis.h contains conflicts with MacTypes.h, so I have included it to resolve those conflicts. The others are included in the interest of building out-of-the-box.
Add preprocessor definitions TABLESDIR and HAVE_CONFIG_H to xcodeproj
Resolve conflicts with MacTypes.h.
Conflicting items in liblouis.h typeforms enum:
  - italic: changed to italic_lou
  - underline: changed to underline_lou
  - bold: changed to bold_lou
Note that these items are also changed where they appear
throughout the code base. Since liblouis.h is a public header, this
breaks api with other versions of liblouis.
Add README.md