dev: Support translating left and right ALT keys.

This is used primarily for VNC.
ide: Accept the IDLE (0xe3) ATA command.

This command is supposed to set up a timer which will put the drive into a
standby mode if it isn't sent a command within a given time out. Since most of
the timeouts are generally significantly longer than a simulation would run
anyway, and we don't have an implementation for standby mode to begin with,
we can accept the command, do nothing, and report success.
config: Get rid of some extra spaces around default arguments.