Removed Doxygen errors from Event.h

- Removed Makefile from branch
- Moved a0..a4/c0..c4 parameter documentation from top level overloaded functions to each function to appease Doxygen.
- Removed @see Event::Event from overloaded functions as the link did not work and the argument parameter documentation was moved down to each function
- TODO: Cleanup EventQueue.h

Author: kegilbert

doxyfile_options

@@ -840,7 +840,6 @@ EXCLUDE_PATTERNS       = */tools/* \
                          */TESTS/* \
                          */targets/* \
                          */BUILD/* \
-                         */events/* \
                          */rtos/* \
                          */cmsis/* \
                          */hal/* \

doxygen_options.json

@@ -8,5 +8,5 @@
     "PREDEFINED": "DOXYGEN_ONLY \"MBED_DEPRECATED_SINCE(f, g)=\" \"MBED_ENABLE_IF_CALLBACK_COMPATIBLE(F, M)=\"",
     "EXPAND_AS_DEFINED": "", 
     "SKIP_FUNCTION_MACROS": "NO",
-    "EXCLUDE_PATTERNS": "*/tools/* */TESTS/* */targets/* */FEATURE_*/* */features/mbedtls/* */features/storage/* */features/unsupported/* */features/frameworks/* */features/filesystem/* */BUILD/* */rtos/* */events/* */cmsis/* */hal/* */features/FEATURES_*"
+    "EXCLUDE_PATTERNS": "*/tools/* */TESTS/* */targets/* */FEATURE_*/* */features/mbedtls/* */features/storage/* */features/unsupported/* */features/frameworks/* */features/filesystem/* */BUILD/* */rtos/* */cmsis/* */hal/* */features/FEATURES_*"
 }