Thermal Camera Graph Improvements about sights HOT 5 OPEN

A HTML canvas is definitely the way to go. I've never used them before, but they would be far more performant (and easier to shift around on the page as well) than what we're using.

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Default min (10 degrees Celsius) and max (40 degrees Celsius) range is also hardcoded in the thermal camera graph
https://github.com/SFXRescue/sights/blob/master/interface/js/graphs/thermalcamera.js#L157

Ideally, we would like some way for the user to configure the range of hues that appear on each thermal camera graph. Some improvements could be made to this code.

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Speaking of, the thermal camera graph is currently a HTML table (gasp) which is generated when the page loads. Surely there's a better way to do this?

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Also added to the list of to-dos: Allow the user to specify whether they want the thermal camera to auto-scale (the current system) or use a preset minimum and maximum temperature range

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Sometimes, green creeps into the colours displayed on the thermal camera graph. I found this map in a YouTube video:

It would be better to implement this than my current hue-based system.

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