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Fixes segfault on callable("string").

Addresses Issue #207.

STM port crashes without this re-init.  There should not be any state in
the core py/ code that relies on pre-initialised data.

Addresses Issue #199.

Also fixes a bug in the for-in-range optimiser.

I hope to remove break and continue byte codes in the future and just
use jump (if possible).

Can now have null bytes in strings.  Can define ROM qstrs per port using
qstrdefsport.h

Note that splitting by explicit string is not implemented so far.

Also, support negative indexes.

Currently, MicroPython strings are mix between CPython byte and unicode
strings. So, conversion is null so far. This dummy implementation is
intended for compatibility with CPython (so, same code can run on both).

Uses stream_unbuffered_readline underline.

Useful as getiter method for objects which are their own iterators, etc.

These are micropython.mem_total(), .mem_current(), .mem_peak(). These are 3
individual functions with simple scalar return value to make sure that
calls to these functions themselves have minimal (hopefully zero) impact on
memory allocation.

In Python, importing module several times returns same underlying module
object. This also fixes import statement handling for builtin modules.

There're still issues:
1. CPython exposes set of loaded modules as sys.modules, we may want to
do that either.
2. Builtin modules are implicitly imported, which is not really correct.
We should separate registering a (builtin) module and importing a module.
CPython keeps builtin module names in sys.builtin_module_names .