Add support Base32 Crockford Stacks EncodeCheck()

[Fantom579]

Add support Base32 Crockford EncodeCheck() for Stacks addresses

[ssg]

@Fantom579 Stacks C32Check doesn't use standard Crockford encoding. For example, "hello world" encodes to "D1JPRV3F41VPYWKCCG" in Crockford, but C32Check's own encoding returns "38CNP6RVS0EXQQ4V34".

This looks like a problematic standard from the get go. How applicable is this? How common is this? What are the use cases?

[ssg]

Closing due to the problematic nature of the spec.