Initial support for python 3 and compatilibity with python 2.

At now, the files cant be saved through the software.

TODO: solve the save file issue.
Unused import line deleted and new bugs discovered.

Fields of 'Controle de Status' isnt working on python2.
Removed a unused line with imports.
Initial rewrite of the save function (use of the with statement).
For now we stick with pyw extension.
Initial use of the 'with' statement at the salvar method.
Salvar function now uses the savename var as expected.
WB mode added to force compatibility between py2 and py3.
Some PEP8 and pylint fixes. Hard word at this strings :'(
GameFile saving support compatible with python 2 and 3.

Unicode Literals will be default for all the code from now.