keys refactoring: removed separate UniversalKey, it is now a direct base of any real keys instead of deleted KeyInstance

src/commonMain/kotlin/net/sergeych/tools/pack_tools.kt

@@ -0,0 +1,10 @@
+package net.sergeych.tools
+
+import net.sergeych.bipack.BipackDecoder
+import net.sergeych.bipack.BipackEncoder
+
+
+inline fun <reified T>bipack(value: T): UByteArray = BipackEncoder.encode(value).toUByteArray()
+
+inline fun <reified T>biunpack(value: UByteArray): T = BipackDecoder.decode(value.toByteArray())
+