there is a bug in paste where the pasted content is written directly to
the prompt buffer instead of being processed. for most content, this is
fine but slash commands are processed line-by-line.
aggregate status updates, e.g. "Set 'verbose' mode.", "Set system
message.", to the end for aesthetics. the status message shouldn't
display while in paste mode
This enhances our regex to support windows style paths. The regex will
match invalid path specifications, but we'll still validate file
existence and filter out mismatches
