Change `EncoderDecoder` pre-calculation input/output types to `Long`

[05nelsonm]

Closes #48

This PR:

• Updates the input/output number types for EncoderDecoder pre-calculation methods from Int to Long
  • May be used when streaming data, not just decoding an Array or String which is limited to Int.MAX_VALUE
• Puts up guards in the base abstraction EncoderDecoder.Config so that only positive values are:
  • Passed to the implementations
  • Returned by the implementations
  • Will otherwise throw an EncodingSizeException
• Adds unit tests for most things in the encoding-core module
  • Don't think it will change very much anymore, so.
• Fixes the Base32.Crockford.Config calculation when hyphenInterval is set to something.
  • Actual tests for this will come later when implemented; things might move around still, so.
• Cleans up some documentation
• Cleans up some code