maa: add global maa.h and maa.hpp and stop using /usr/include/maa/

* pkg-config now only sees maa.h & maa.hpp
* usage of maa/*.{h,hpp} is still allowed
* examples updated to use maa.{h,hpp}

Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>

Doxyfile.in

@@ -754,6 +754,7 @@ WARN_LOGFILE           =
 # Note: If this tag is empty the current directory is searched.
 
 INPUT                  = @CMAKE_CURRENT_SOURCE_DIR@/api/ \
+                         @CMAKE_CURRENT_SOURCE_DIR@/api/maa/ \
                          @CMAKE_CURRENT_SOURCE_DIR@/README.md \
                          @CMAKE_CURRENT_SOURCE_DIR@/docs/