#18 add grafana 7 compatibility

[j-or]

#fix #18

[nlubello]

Tested on Grafana 7.2.1 with influxDB query
SELECT "lat"::float / 10000000 AS "lat", "long"::float / 10000000 AS "lon" FROM "gps" WHERE ("device" = 'Telemetry_ESP32_0001') AND $timeFilter

[usommerl]

Hi,

Thanks for working on Grafana 7 compatibility. I'm really looking forward to this!
I have tested this PR with Grafana v7.2.1 and an InfluxDB data source successfully.

I have noticed that some features of v1.2.x are no longer present in this version. These features are not that important for my use case right now, but I will mention them here nonetheless:

• I'm no longer able to set the initial map center latitude/longitude and zoom level to the current value of the map via a button
• The configuration option "Re-center map" is missing

[Alkarex]

Thanks for the feedback @usommerl 👍
I think that is good enough for a first release of this new 2.x branch.

[sefininio]

Hi,

Thanks for working on this compatibility 7.x.x issue!
However, I don't see it in the grafana plugin store: https://grafana.com/grafana/plugins/alexandra-trackmap-panel
the newest version there is 1.2.5

When will 2.0.0 be released?

[usommerl]

@jsBlackBelt Please subscribe to this PR

[Alcarin]

Seems Grafana developer are waiting your feedback @Alkarex ?