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This would be used once imported media are stored as Media*

Cleaned MetaDataManager/Worker code, removed renderWidget, avoiding to permanent warning.

Module now also have an internal representation that allows us to keep
data private. Don't know if this will be used though, but i'd rather do
this now than three month from now :)

basic errors are detectes, symbols are exported as expected... yeah o//

This does nothing unless browsing modules directory.

There's also the pro and a simple sh script to launch the binary easily.