fix memory leak in json reader when handling incomplete tokens

add test for parsing json with multiple incomplete tokens

simplify cx_json_value_nothing initialization

add first draft of json implementation - relates to #431

add missing dependencies for test_properties.o

add convenience macro for cx_reallocate to hide the (void**) cast

remove <sys/types.h> include from common.h

add extern "C" to iterator.h

add extern "C" to properties.h

add test coverage for unlinking tree nodes w/o prev pointer

add max depth for tree search - closes #459

fix totally bugged assertion in cxPropertiesUseStack()

add source/sink facility for properties - fixes #430

fix missing parameter doc

fix several survivors of east-const and some missing consts

fix invalid reads when removing linked list nodes

add implementation for the properties parser

add ucx2.1 style interface for a properties parser

also report coverage for header files

make loc_prev in trees optional - fixes #433

update CHANGELOG

add possibility to remove arrays of data and retrieve removed data

add cxTreeSetParent()

add functions to start iteration in a subtree

add missing details for 100% test coverage in tree.c

add test for creating an iterator over an empty tree

simplify tree class

implement cxTreeDestroyNode and cxTreeDestroySubtree - resolves #438

fix missing free() in test_array_insert_sorted

fix missing free() in test_tree_add_duplicate_root

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