Background services for picking up scores

[kmeesters]

We need a background process (in the scorekeeper client) that:

• Scans a directory for new scoresheet files
• Get the scores, teamNR, roundNR, teeamNAME, from scoresheet file
• Store in scores.json
• 'Mark' the scoresheet as done (TBD)
• Optional: add log entry for tracking/debugging

After implementation we should remove the updating of scores.json from the save function in the scoresheet.

Referring to #75

[kmeesters]

Additional request: fire the background service manually through a button in the "Scores" page

[poelstra]

Status after e354b7f:

• Scoresheet no longer modifies scores list, only saves scoresheet
• Scoresheets are now saved to the scoresheets subdir of data
• $scores now has method pollSheets() to poll for new sheets, adds them to scores list, then saves the list
• A log message is added when a new scoresheet has been processed

Note: updating the scorelist is now manual (by pressing the button on the Scores page), i.e. there is no automatic background polling, and no automatic poll at e.g. page load. Reason is that there's currently no way to know whether the client is run in referee or scorekeeper mode.

Note 2: I've only implemented the directory listing for node yet, so it will not work on e.g. phonegap. This is not very critical though, because this whole quick-fix scorekeeper-mode won't be used as an app anyway.

[poelstra]

So, basically this whole ticket has been implemented, except for automatic polling (see above).

[kmeesters]

I'm sure @robvw can manage to "Push the button" (<- chemical brothers 🎵 )

[rikkertkoppes]

Moving to next milestone to implement automatic polling