Protokol 2.0.0

• changed ProtokolObject API to have abstract protokol property to returns lambda with Protokol receiver; this will make Protokol DSL code more concise
• add support for UByte, UShort, UInt and ULong types
• simplify Protokol's VLE encoding to use either 1 or 4 bytes; this will double maximum supported size from 2^30 to 2^31
• upgrade Kotlin version to 1.5.20
• upgrade Gradle version to 7.0.2
• publish to Maven Central instead of Bintray