Refactor data handlers + misc fixes
This refactors the data handlers into a more standard/understood model-like architecture, to prepare for a new, more robust config system. It also fixes a problem with creating new Notes and uploading new Photos via the web interface (related to #58). Finally, it speeds up docker builds by sending in less files, which aren't necessary or will be built anyway. This is all in preparation to allow building #13 more robustly.
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Bruno Bernardino