KSL: expand catch to catch code

[Bo Zou]

This is a proposal to expand the catch keyword to catch code as follows:

   } catch (*CodedException ex, "code1"*) { // only code1 is caught
    } catch (*CodedException ex, "code2", "code3"*) { // both code2 and
code3 are caught
     } catch (*CodedException* | IOException ex*, "code4", "code5"*) {
      // catches code4, code5 and IOException
    } catch (CodedException ex) { // all codes are caught

Details:

http://tri-katch.blogspot.com/2015/05/catch-code-proposal-to-expand-catch-in.html
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