Polly style minimalist status messages

The current output of PirateDiffusion is handy for debugging, but is too verbose for browsing channels. We are proposing a minimalist mode by default that

• does the thinking face similar to how polly thinks

• gives very minimalistic time estimates like "brb, eta 30s..."

• deletes old status messages after images are created

Management of this setting:

/setting /silent:default
/setting /silent:on - totally silent
/setting /silent:debug - the current pirate diffusion experience