Distinguish between Mid statement and Mid function.

Author: comintern

Rubberduck.Parsing/Grammar/VBALexer.g4

@@ -50,8 +50,8 @@ LENB : L E N B;
 LONGLONG : L O N G L O N G;
 LONGPTR : L O N G P T R;
 MIDB : M I D B;
-MIDBTYPESUFFIX : M I D B '$';
-MIDTYPESUFFIX : M I D '$';
+// MIDBTYPESUFFIX : M I D B '$';
+// MIDTYPESUFFIX : M I D '$';
 OPTION : O P T I O N;
 PSET : P S E T;
 SCALE : S C A L E;