refactor(model-api)!: rename node id property key to #originalRef#

BREAKING CHANGE: The id property has been renamed from #mpsNodeId# to #originalRef# to better describe the contained value. Users should not use this value directly but instead use INode::getOriginalReference().

Author: mhuster23

model-api/src/commonMain/kotlin/org/modelix/model/api/INode.kt

@@ -211,6 +211,7 @@ interface INode {
      * @return the original reference of this node
      */
     fun getOriginalReference(): String? = getPropertyValue(IProperty.fromName(NodeData.ID_PROPERTY_KEY))
+        ?: getPropertyValue(IProperty.fromName("#mpsNodeID#")) // for backwards compatibility
 
     // <editor-fold desc="non-string based API">
     fun usesRoleIds(): Boolean = false

model-api/src/commonMain/kotlin/org/modelix/model/data/ModelData.kt

@@ -86,7 +86,11 @@ data class NodeData(
     val references: Map<String, String> = emptyMap(),
 ) {
     companion object {
-        const val ID_PROPERTY_KEY = "#mpsNodeId#"
+
+        /**
+         * Users should not use this directly. Use [INode.getOriginalReference].
+         */
+        const val ID_PROPERTY_KEY = "#originalRef#"
 
         @Deprecated("Use ID_PROPERTY_KEY", replaceWith = ReplaceWith("ID_PROPERTY_KEY"))
         const val idPropertyKey = ID_PROPERTY_KEY