Issue 187 enable skipped ztest suites (#189)

* Fix some ztests that were skipped

* Expose bacapp_same_value()

* Fix bacapp, ptransfer tests

* Fix bugs in Load_Control object & tests

* refactor days functions from datetime module

* fix legacy ctests

* Add bacnet/basic/sys/days.[ch] to Zephyr build

* Update ztest to match from Zephyr v2.6.0; update ringbuf, datetime to build

* Fixup ztest test for object/acc

* Fix bvlc_address_from_ascii; enable/fix bvlc test

* Comment cleanup

* test/bacnet/basic/object/lc partially enabled

* Fix bacapp_decode_data_len return status on erroneous input

* fix ztest include fatal error

* fix ztest strsignal reference fatal error

* fix zassert_mem_equal reference syntax error

* fix zassert_mem_equal reference syntax error

Co-authored-by: Gregory Shue <gregory.shue@legrand.us>
Co-authored-by: Steve Karg <skarg@users.sourceforge.net>

test/datetime.mak

@@ -4,7 +4,7 @@ SRC_DIR = ../src
 INCLUDES = -I$(SRC_DIR) -I.
 DEFINES = -DBIG_ENDIAN=0 -DBAC_TEST -DTEST_DATE_TIME
 
-CFLAGS  = -Wall $(INCLUDES) $(DEFINES) -g
+CFLAGS  = -Wall $(INCLUDES) $(DEFINES) -g -Wmissing-prototypes
 
 SRCS = $(SRC_DIR)/bacnet/datetime.c \
 	$(SRC_DIR)/bacnet/bacdcode.c \
@@ -16,6 +16,7 @@ SRCS = $(SRC_DIR)/bacnet/datetime.c \
 	$(SRC_DIR)/bacnet/lighting.c \
 	$(SRC_DIR)/bacnet/bactext.c \
 	$(SRC_DIR)/bacnet/indtext.c \
+	$(SRC_DIR)/bacnet/basic/sys/days.c \
 	ctest.c
 
 OBJS = ${SRCS:.c=.o}