fix: fix csml language

Author: Gregor Holzer

src/main/resources/pkl/csm/csml.pkl

@@ -123,11 +123,10 @@ class ResetDescription extends ActionDescription {
 
 class CaseDescription {
   of: Expression
-  then: ActionDescription
+  then: Listing<ActionDescription>
 }
 
 class MatchDescription extends ActionDescription {
-  value: Expression
   cases: Listing<CaseDescription>
   default: ActionDescription?
 }