Implement Teju Jagua decimal string generator for all floating-point types

[Ravenwater]

There is a new decimal string generator algorithm for floating-point types called Teju Jagua developed by @cassioneri

https://github.com/cassioneri/teju_jagua

It would be quite productive if we could create one algorithm to generate scientific format decimal string approximations for all floating-point types in Universal. The conversion algorithms both in and out of the types tend to be the majority of the code for an arithmetic type. Common generator code would be beneficial for providing the same behavior for printing across all types, and reuse key code.