Upgraded to Grafana 7

Upgraded to influx 1.8

Merged queries in most graphs
Added Usage by month: ab5g https://forum.netgate.com/post/954800
Gatway loss: Condoamanti https://github.com/VictorRobellini/pfSense-Dashboard/pull/22

Changed lots of graphs around. I tinkered with other types of graphs but I stuck with the standard graph format so that I could view trends and spikes over a time period.
I added interface information to each interface section - friendlyname - I would love to add it to the header, but I don't know how.

More changes than I can remember

README.md

@@ -28,7 +28,7 @@
 ```docker-compose
 
   grafana-pfSense:
-    image: "grafana/grafana:6.7.2"
+    image: "grafana/grafana:7.4.3"
     container_name: grafana
     hostname: grafana
     mem_limit: 4gb
@@ -51,7 +51,7 @@
     network_mode: bridge
 
   influxdb-pfsense:
-    image: "influxdb:1.7.10-alpine"
+    image: "influxdb:1.8.3-alpine"
     container_name: influxdb
     hostname: influxdb
     mem_limit: 10gb