Add thermometer rendering based on current and target values

[MisterJames]

Two aspects to this:

• data entry on the Campaign Edit page
• rendering the thermometer on the public campaign page (for numeric impact types)

From #35.

[MisterJames]

Starting this. from the sky...muahahahah....

[MisterJames]

@joelhulen Is there any reason I can't change the CampaignImpactType to an enum?

[joelhulen]

@MisterJames Absolutely no reason not to. In fact, I was going to do that after creating a class to hold those types of objects (enums and structs). I had brought it up at one point, but it was tabled while we were working through other issues.

I also like getting rid of magic strings. I think a static class named something like "EnumsAndStructs" or "WellKnownNames" would be clear as to its intent.

[MisterJames]

Beauty, thanks @joelhulen. I'll do the enum part here as part of this issue.

[MisterJames]

Update...first rev will look something like this:

This will just be a temp thing until we get a better thermometer control in place.

[stimms]

It you want to open a new issue on improving the look of that and assign it to me I'll d3 up something

[tonysurma]

@stimms done. Feel free to d3 the heck out of it 👽