modure: Initial module, using re1.5 (which is based on re1 codebase).

https://github.com/pfalcon/re1.5
modure: Import needed files from re1.5 v0.5.

https://github.com/pfalcon/re1.5
modure: Basic tests.
Merge branch 'modure' of https://github.com/pfalcon/micropython into pfalcon-modure
stmhal: Enable ure module (tests pass on pyboard).
Merge branch 'pfalcon-modure'