test coverage for cx_strcmp pointer variants

allow NULL for allocator and comparator

add docs for CX_STORE_POINTERS and remove cxHashMapCreateForPointers()

add CX_STORE_POINTERS special item size for maps

add CX_STORE_POINTERS special "item size" for lists

add unit test for cxListClear + fix destructor functions not always invoked with the correct pointer

fix hashmap iterator skipping the second element in some cases

add cxListClear and fix missing destructor invocations - #241 #246

add cx_hash_key_cxstr() macro

add simple functions for creating lists

add CX_LINKED_LIST_SORT_SBO_SIZE macro

add some asserts

split cxMapRemove() to cxMapRemoveAndGet()

make hashmap store objects instead of pointers by default - fixes #239

add CxListComparator compatible string compare functions

fix gmock being build and gtest and gmock being installed

implement backwards iterator - fixes #238

Automated merge

rename test directory to avoid name clash with Makefile target

fix README showing how tests were run in the automake era

fix last change of mul overflow builtin breaking non-windows compilations

fix code not compiling under windows+mingw

fix wrong types for umul overflow builtins

remove too platform dependent printf tests

(0) -300 -100 -50 -24 +24 +50 +100 +300 tip

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