add lexer and parser for export function binding generation

CodeGen/BMapBindings/ExpFctsLexer.g4

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+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 ;

CodeGen/BMapBindings/ExpFctsParser.g4

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+parser grammar ExpFctsParser;
+options { tokenVocab = ExpFctsLexer; }
+
+program: fctDecl* ;
+
+fctDecl
+    : EXPFCTS_EXPORT varType EXPFCTS_IDENTIFIER '(' (fctArg (',' fctArg)*)? ')' ';'
+    ;
+
+fctArg
+    : EXPFCTS_FILE_DECL '(' EXPFCTS_IDENTIFIER ')' # fctArgFileDecl
+    | EXPFCTS_MESHTRANS_DECL '(' EXPFCTS_IDENTIFIER ')' #fctArgMeshTransDecl
+    | EXPFCTS_OBJECT_DECL '(' EXPFCTS_IDENTIFIER ',' EXPFCTS_IDENTIFIER ')' # fctArgObjDecl
+    | EXPFCTS_PARAM_IN '(' varType ',' EXPFCTS_IDENTIFIER ')' # fctArgParamIn
+    | EXPFCTS_PARAM_OUT '(' varType ',' EXPFCTS_IDENTIFIER ')' # fctArgParamOut
+    ;
+
+varType
+    : EXPFCTS_IDENTIFIER ('::' EXPFCTS_IDENTIFIER)* '*'? 
+    ;
+