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/pool/Makefile

@@ -3,8 +3,8 @@ CC := gcc
 CFLAGS := -I../../include -I. \
           -g -O3 -Wall -Werror -DPOOLS_TEST_ENV=yes
 
-SRC            := pool_test.c ../../source/pool.c
-OUT            := build/pool_test
+SRC            := pool_test.c ../../source/pool.c ../../source/bitset.c
+OUT            := build/pool_test 
 
 $(OUT): $(SRC) | build
 	$(CC) $(CFLAGS) -o $@ $^