GitLab

- in some files container hasn't got 'media-type' attribute

- lupdate cannot parse them any more (compressed now)
- use fake QML file

- due to new instrument support
- but compression gives almost 20 times file reduction

Conflicts: WizardClef.qml

- break zip lookup when file is found

- wrap strings properly

- get rid of libzip + libzippp dependence
- use custom proxy functions to handle [de]compressing

Merge mxl branch to upstream

- in expert mode it was staying put

- divide text, append guitar part when instrument is guitar