Some fixes to recent files (#3621)

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* Add a factory default data/projects/templates/default.mpt. Fixes #528
* On launch, if the last project was a template we create a new project (default.mpt) instead.
* If there is a recovery file present and you discard it we create a new project as the project launched could be defective or, if .lmmsrc.xml wasn't written, an earlier project.

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