currency: switched crypto api and combined rates to allow cross-lookup #1629
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This PR combines the fiat currency rates and the cryptocurrency rates into one global variable
rates
instead of keeping the two separate.This was done to allow better cross-compatibility between the two sources, allowing one to look up a conversion from a currency in one table, to a currency in the other.
To do this, a change of API was also done, as the old API used a weird and inflexible way to look up conversions.
The code also changed some variable names that I didn't like. mostly the "of" and "to" variables were changed to base and target respectively.
This change also entirely eliminates the need for a separate crypto rates function.