CommandClient: suppress (most) parse errors
CommandClient: suppress (most) parse errors

This commit has CommandClient attempt to test whether a message was
really a command before printing shell parse errors. Without this patch,
all command clients on the bus will reply with a parse error if someone
sends a message leading with punctuation and containing an apostrophe.

Bob131/JiyuuBot-ng,Bob131/JiyuuBot,Bob131/JiyuuBot-ng,Bob131/JiyuuBot-ng