plan9 cleanups

* rename files to adhere to conventions
 * remove unnecessary function / optionality
 * fix merge conflict
 * better panic message
 * remove unnecessary TODO comment
 * proper namespacing of declarations
 * clean up documentation comments
 * no copyright header needed for a brand new zig file that is not
   copied from anywhere
476faef97aAndrew Kelley committed on 7/8/2021, 9:24:16 PMparent4eb778f
7 files changedLine totals unavailable