Add methods to get track from pattern and event from track

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>
Revert "Add methods to get track from pattern and event from track"

This reverts commit 24b2a9b760144905c4329bddf351cb8ddb04c5cc.
Merge branch 'master' of github.com:cmatsuoka/libxmp-python
Update examples to use the new OO API

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>
Add version retrieval calls and clean up module in destructor

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>