Handle suffix as a plain param

[belak]

This replaces the internal handling of suffix and treats it as "just another param". Thankfully, this lets us clean up command parsing because we don't need to handle suffix vs params separately for every single command.

[belak]

This also modifies mode parsing to allow + and - in the same mode setting, so you can specify "+stuff-otherstuff" and have it work.

[aatxe]

Thanks!