Feature/add memap cstack usage ports (#661)

* Added memap, avstack, and checkstackusage tools to STM32F4xx Makefile and CMake builds to calculate CSTACK depth and RAM usage

* Added memap, cstack, and ram-usage recipes to stm32f10x port Makefile.  Added Cmake build.

* Removed local dlmstp.c module from stm32f10x port, and used the common datalink dlmstp.c module with MS/TP extended frames and zero-config support.

* Added .nm and .su to .gitignore to skip the analysis file residue.

tools/check-stack-usage/tests/Makefile

@@ -0,0 +1,23 @@
+OBJ:=$(patsubst %.c, %.o, $(wildcard *.c))
+CFLAGS:=-fstack-usage
+TARGET:=main
+CC?=gcc
+
+all:	${TARGET}
+	@echo "=============================================="
+	@../checkStackUsage.py $< . 2>&1 | \
+		grep -E '(func|foo|bar|main) '
+	@echo "=============================================="
+	@echo "1. The output shown above must contain 4 lines"
+	@echo "2. 'foo' and 'bar' must both be calling 'func'"
+	@echo "   *but with different stack sizes in each*."
+	@echo "3. 'main' must be using the largest 'func'"
+	@echo "   (i.e. be going through 'bar')"
+	@echo "4. The reported sizes must properly accumulate"
+	@echo "=============================================="
+
+${TARGET}:	${OBJ}
+	${CC} -o $@ ${CFLAGS} $^
+
+clean:
+	rm -f ${OBJ} ${TARGET} *.su