* Changed global prefix "c_c_" to "a_".
* Improved FOR_ macros.
* Improved bugs handling with a_bug_if() and a_warn_if().
+ Added aItemIter struct for loops operations.
* Nodes from aList and aBBTree now have their own definition structs.
* Improved the List api.
+ Added a Balanced Binary Tree library (implemented as Black-Red Tree).