refs #35 started user class serialization; started MP compression

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

@@ -0,0 +1,14 @@
+package net.sergeych.lynon
+
+/**
+ * Variant of [LynonEncoder] that writes to embedded [MemoryBitOutput]
+ */
+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))