TSS: reserve some characters for TSSCP, TSSCCjs, and so on

[toyoshim]

To make TSSCP works even in the feature, probably it's better to reserve some characters so that TSSCP can recognize its extended format and original format correctly. E.g., ';' should not be used in TSS's MML because it is used by TSSCP.

Also, if we want to use TSSCP on Twitter, '#' is a little troublesome because the character is used for hash tag. Probably, we should reserve another character to be an alternative, e.g., '!' could be a candidate.