Add time between events to events views on tracker page

[anthonyisensee]

This should be added to a dedicated column on the events table on a single tracker page. Each td should show the time since the event in the previous row. The very bottom td in the column should shown the no time symbol used elsewhere.

[anthonyisensee]

@Geo-Bold any interest?

[Geo-Bold]

Hmm. Let me see what I can do :)

[anthonyisensee]

@Geo-Bold this is still a good first issue.

The new column should be:

• Added to both the /tracker and /events pages
• To the right of the "Description" column on the /tracker page.
• To the right of the "Occurred" column on the /events page.
• Labeled "Former Event Was"

The <tr> <td>s should:

• Have text of "<number> <largest unit> ago"
• The bottom (oldest) one should not have an entry as there is no previous event for it to calculate time against.
• Be updated every second.

Similar code to reference would be that for the Trackers "Last Event Was" column or Events "Occurred" column. This provides similar output but against the current time (as opposed to the time of the last event).