Major code reorganization

This commit only updates the XCode project for the changes.
A later commit each will update it for scons and MSVC.

A few actual changes are mixed in:
- Add a prefix header for a handful of common definitions
- Moved current_cursor into the Cursor class as a static member
- Removed the make_cursor_sword and make_cursor_watch functions
- Include tests in the All target
- Remove redundant -l flags for Common and Common-Party (since they're included in the Link phases anyway)

.gitignore

@@ -61,7 +61,7 @@ pkg/win/data.nsi
 
 # Shader Builder projects
 # It's an sqlite3 database and not particularly important, so exclude it
-src/tools/*.sbproj
+*.sbproj
 
 # Doxygen stuff
 src/doxy/html/