Update list implementation to work with memory pools (#168)

* Introduce indexed list implementation

* Fix CI tests for pool

* Take bitset out of pool

* Replace joker bitset interactions with wrappers

* Add bitset tests

* Add test to gitignore

---------

Co-authored-by: rfehr-idexx <ric-fehr@idexx.com>

tests/list/Makefile

@@ -0,0 +1,19 @@
+
+CC := gcc
+CFLAGS := -I../../include -I. \
+          -g -O3 -Wall -Werror -DPOOLS_TEST_ENV=yes
+
+SRC            := list_test.c          \
+                  ../../source/list.c  \
+                  ../../source/pool.c  \
+                  ../../source/bitset.c
+OUT            := build/list_test 
+
+$(OUT): $(SRC) | build
+	$(CC) $(CFLAGS) -o $@ $^ 
+
+build:
+	mkdir -p build
+
+clean:
+	rm -f $(OUT)