refactor(core): add IO module and integrate GameContext import/export traits

modules/io/src/main/scala/de/nowchess/io/GameContextExport.scala

@@ -0,0 +1,9 @@
+package de.nowchess.io
+
+import de.nowchess.api.game.GameContext
+
+trait GameContextExport {
+  
+  def exportGameContext(context: GameContext): String
+  
+}

modules/io/src/main/scala/de/nowchess/io/GameContextImport.scala

@@ -0,0 +1,9 @@
+package de.nowchess.io
+
+import de.nowchess.api.game.GameContext
+
+trait GameContextImport {
+  
+  def importGameContext(input: String): GameContext
+
+}