Introduce support for some common D-Bus annotations (#30)

* Add ability to declare property behavior on PropertyChanged signal

* Add support for Method.NoReply annotation (WIP)

* Add support for common annotations/flags

CMakeLists.txt

@@ -32,6 +32,7 @@ set(SDBUSCPP_CPP_SRCS
     ${SDBUSCPP_SOURCE_DIR}/Object.cpp
     ${SDBUSCPP_SOURCE_DIR}/ObjectProxy.cpp
     ${SDBUSCPP_SOURCE_DIR}/Types.cpp
+    ${SDBUSCPP_SOURCE_DIR}/Flags.cpp
     ${SDBUSCPP_SOURCE_DIR}/VTableUtils.c)
 
 set(SDBUSCPP_HDR_SRCS
@@ -56,7 +57,8 @@ set(SDBUSCPP_PUBLIC_HDRS
     ${SDBUSCPP_INCLUDE_DIR}/MethodResult.h
     ${SDBUSCPP_INCLUDE_DIR}/sdbus-c++.h
     ${SDBUSCPP_INCLUDE_DIR}/Types.h
-    ${SDBUSCPP_INCLUDE_DIR}/TypeTraits.h)
+    ${SDBUSCPP_INCLUDE_DIR}/TypeTraits.h
+    ${SDBUSCPP_INCLUDE_DIR}/Flags.h)
 
 set(SDBUSCPP_SRCS ${SDBUSCPP_CPP_SRCS} ${SDBUSCPP_HDR_SRCS} ${SDBUSCPP_PUBLIC_HDRS})