Relented on the strict import of direct objects/classes for the typing
module only. Typing module components can be directly imported because
it makes the code really painful to read and write otherwise.
This is still in-line with the python style guide adopted from Google at
http://google.github.io/styleguide/pyguide.html section 2.2.
It now makes use of the original array's symbol table to get the pointer
template, such that the size of the pointer is correct according to the
original table. Resolves "pointer.size" attribute errors (firing inside
a property and thus throwing off unusual exceptions).
Added object extensions for the key structures. Also added
constants.linux, which will contain Linux-specific constants
that can't be extracted via dwarf.
Mike Auty