try-catch-finally opeator

[arakov]

Redesign try-catch-finally opeator to simplify its syntax and free | operator for #538

[arakov]

A
{
    test2() { console.writeLine("test2") }
}

public program()
{
    var a:= new A();

    // try alternatives
    a.test() \ test2();        

    // try and catch
    a.test() \\ on:(Exception e) { console.writeLine("exception") };    

    // try, finally and catch
    a.test() $fnl { console.writeLine("finally") }  \\ on:(Exception e) { console.writeLine("exception") };
}    

[arakov]

done