Bugfix/double float promotion warnings (#605)

* Fixed compile warnings from double-float promotions.

* Changed zephyr compile to suppress deprecation warnings

* Fixed CreateObject API return value in many objects header files

* Changed zephyr build defines as strdup is no longer required for log print of strings

test/bacnet/basic/object/ai/CMakeLists.txt

@@ -50,6 +50,7 @@ add_executable(${PROJECT_NAME}
 	${SRC_DIR}/bacnet/indtext.c
 	${SRC_DIR}/bacnet/hostnport.c
 	${SRC_DIR}/bacnet/lighting.c
+    ${SRC_DIR}/bacnet/proplist.c
 	${SRC_DIR}/bacnet/timestamp.c
 	${SRC_DIR}/bacnet/memcopy.c
 	${SRC_DIR}/bacnet/wp.c

test/bacnet/basic/object/av/CMakeLists.txt

@@ -50,6 +50,7 @@ add_executable(${PROJECT_NAME}
 	${SRC_DIR}/bacnet/indtext.c
 	${SRC_DIR}/bacnet/hostnport.c
 	${SRC_DIR}/bacnet/lighting.c
+    ${SRC_DIR}/bacnet/proplist.c
 	${SRC_DIR}/bacnet/timestamp.c
 	${SRC_DIR}/bacnet/memcopy.c
 	${SRC_DIR}/bacnet/wp.c