Automatically load the last opened project on launch

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The subject says it all…

Example (for really stupid guys):
  1. I work on project X
  2. I close LMMS
  3. I launch it again
  4. Project X is loaded without any further action
Hi!

I've already opened an issue for this at the github tracker (where the development is done) .
https://github.com/LMMS/lmms/issues/503