Display track timestamp

[adlawson]

These changes add track timings to the tracklist.

It also includes an options page to enable the feature (disabled by default).
When enabled, the start time is shown instead of the track number. If disabled or timings aren't available, the track number is shown just like before.

This needs some further testing before merged and released.

• Chrome extension
• Firefox addon
• Tampermonkey userscript

Resolves #11, #6.

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[zygisber]

That is exatcly what was requested! How ever I suggest allways display track_nuber:

                        <em>{track_number}</em>
                        {?timestamp}<em style="width:50px;">{timestamp}</em>{/timestamp}

[zygisber]

Finally uploaded buildable sources. You can check my fork.