Making the `ToString` paramters optional (IFormattable)

[lipchev]

• removed the ToString(IFormatProvider?) overload from the IQuantity interface
• removed the ToString overloads from the generated quantities (and HowMuch)
• replaced the usages of ToString(IFormatProvider?) in the tests

duplicate of #1552

[lipchev]

Hm, I was expecting there to be a very small size difference compared to #1552, but

before: 2.19 MB (2 301 440 bytes) after: 2.18 MB (2 287 616 bytes) #1552 : 2.17 MB (2 286 080 bytes) 😮

I don't know what to make of these numbers..

Anyway, I was also a little surprised by the number of breaking changes that this caused in the tests (non-generated).. I initially found the ToString extensions a little awkward, but I now I think they might be the better option..

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