Revert "Remove IdentifierSettings "maxLength" and "statechartPrefix""

This reverts commit 61bb4ceace01bac8cdd9bdd8ed6fe1e7598e6082.

plugins/org.yakindu.sct.generator.c/library/FeatureTypeLibrary.xmi

@@ -11,6 +11,13 @@
     <parameters
         name="moduleName"
         optional="true"/>
+    <parameters
+        name="statemachinePrefix"
+        optional="true"/>
+    <parameters
+        name="maxIdentifierLength"
+        optional="true"
+        parameterType="INTEGER"/>
     <parameters
         name="separator"
         optional="true"/>