build: rename .metamodel-export-mps to metamodel-export including gradle pluginID

also change the package from `org.modelix` to `org.modelix.mps`

Author: nkoester

metamodel-export-mps/.mps/.gitignore renamed to metamodel-export/.mps/.gitignore

@@ -5,6 +5,8 @@ plugins {
     id("org.modelix.mps.build-tools") version "1.0.11"
 }
 
+group = "org.modelix.mps"
+
 val generatorLibs by configurations.creating
 
 dependencies {
@@ -34,7 +36,8 @@ extensions.configure<MPSBuildSettings> {
     search(".")
     disableParentPublication()
 
-    publication("metamodel-export-mps") {
+
+    publication("metamodel-export") {
         module("org.modelix.metamodel.export")
     }
 }

metamodel-export-mps/.mps/.name renamed to metamodel-export/.mps/.name

@@ -77,7 +77,7 @@ testing {
                 implementation(project(":model-api-gen-gradle"))
                 implementation(project(":model-api"))
                 implementation(project(":model-api-gen"))
-                implementation(project(":metamodel-export-mps"))
+                implementation(project(":metamodel-export"))
             }
 
             targets {