refs #35 bit granularity for bitstreams; LZW done

lynglib/src/commonMain/kotlin/net/sergeych/lynon/tools.kt

@@ -5,10 +5,11 @@ package net.sergeych.lynon
  */
 class LynonPacker(bout: MemoryBitOutput = MemoryBitOutput(), settings: LynonSettings = LynonSettings.default)
     : LynonEncoder(bout, settings) {
-    fun toUByteArray(): UByteArray = (bout as MemoryBitOutput).toUByteArray()
 }
 
 /**
  * Variant of [LynonDecoder] that reads from a given `source` using [MemoryBitInput]
  */
-class LynonUnpacker(source: UByteArray) : LynonDecoder(MemoryBitInput(source))
+class LynonUnpacker(source: BitInput) : LynonDecoder(source) {
+    constructor(packer: LynonPacker) : this(MemoryBitInput(packer.bout as MemoryBitOutput))
+}