ByteCount polish update

Added some documentation here and there, a couple of optimizations, reconfigured gradle
Full Changelog: 0...1

ByteCount functionality update

Introduced:

• to*Components overloads similar to those in kotlin duration
• a few operators
• strictness with conversions, avoiding floating point numbers
• default objects in companion object
• some tests

Sample on kotlin playground: https://pl.kotl.in/RcO2AmxfD