make allocator in cxBufferInit optional

increase test coverage - fixes #250

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

(0) -300 -100 -10 +10 +100 +300 tip

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