Updated hashrate graphs in dashboard

* [FEATURE] Display both pool and personal hashrate
* [FEATURE] Use EnhancedLegendRendere to toggle lines in graph
* [IMPROVEMENT] Unified Ajax call for graph and gauges
* [IMPROVEMENT] Allow `getdashboarddata` to supply raw hashrate values
Adding share rate graph

* [FEATURE] Adding share rate to graph
Improved dashboard overview graphs and gauges