feat: base structure for getting a MultiDivert.

InkBlot/InkBlotAntlrGrammar.g4

@@ -13,19 +13,30 @@ story: topLevelStatements ;
  */
 
 topLevelStatements:
-    contentText+
+    topLevelStatement+
+    ;
+
+topLevelStatement:
+    contentText
+    | multiDivert
     ;
 
  knotLevelStatements:
-    contentText+
+    (contentText
+    | multiDivert
+    )+
     ;
 
  stitchLevelStatements:
-    contentText+
+    (contentText
+    | multiDivert
+    )+
     ;
 
  innerBlockLevelStatements:
-    contentText+
+    (contentText
+    | multiDivert
+    )+
     ;
 
 /*
@@ -52,7 +63,10 @@ inlineLogic:
     INLINE_LOGIC_START
     WS?
     innerLogic
+    // TODO: += and -= are disabled here (don't know why)
+    WS?
     INLINE_LOGIC_END
+    // TODO: tags ftw
     ;
     
 innerLogic:
@@ -97,7 +111,7 @@ expression:
 
 // all possible symbols or word(s) for sequencing
 sequenceTypeAnnotation:
-    SEQUENCE_TYPE_SYMBOL_ANNOTATION
+    op=SEQUENCE_TYPE_SYMBOL_ANNOTATION
     | ONCE
     | CYCLE
     | SHUFFLE