work around some MSC problems

fix common.h include problems - fixes #255

fix wrong operator precedence in destructor macros

add pointer array list tests

reformat code

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

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

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