refactoring of collections to make use of destructors in map implementations

fix initial storage allocation for array lists created with CX_STORE_POINTERS

simplify cx_stream_ncopy()

add stream copy utils - fixes #254

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

add cx_hash_key_cxstr() macro

(0) -300 -100 -15 +15 +100 +300 tip

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