add lexer and parser for export function binding generation

CodeGen/BMapBindings/ExpFctsLexer.g4

@@ -0,0 +1,23 @@
+lexer grammar ExpFctsLexer;
+
+// keywords
+EXPFCTS_EXPORT: 'LIBCMO_EXPORT' ;
+EXPFCTS_FILE_DECL: 'BMPARAM_FILE_DECL' ;
+EXPFCTS_MESHTRANS_DECL: 'BMPARAM_MESHTRANS_DECL' ;
+EXPFCTS_OBJECT_DECL: 'BMPARAM_OBJECT_DECL' ;
+EXPFCTS_PARAM_IN: 'BMPARAM_IN' ;
+EXPFCTS_PARAM_OUT: 'BMPARAM_OUT' ;
+
+// symbols
+EXPFCTS_LPARENTHESES: '(' ;
+EXPFCTS_RPARENTHESES: ')' ;
+EXPFCTS_COMMA: ',' ;
+EXPFCTS_SEMICOLON: ';' ;
+EXPFCTS_STAR: '*' ;
+EXPFCTS_DOUBLE_COLON: '::' ;
+
+// identifider
+EXPFCTS_IDENTIFIER: [_a-zA-Z][_a-zA-Z0-9]* ;
+
+// remove whitespace and line break
+EXPFCTS_WS: [ \t\n\r\f]+ -> skip ;