* feat: forward requested command-line options
The CLI now forwards the `-ac`, `-audit`, `-auth`, `-core`,
`+extension`, `-extension`, `-glamor`, `-listen`, `-nolisten`, and `-verbose` flags
to `Xwayland`. In addition, command-line flags no longer require the
display to be the first parameter. Also the `-help` and `-version` flags
were added, which print the relevant message and return 0.
The match case structure should make it easier to add new arguments if
people have use for them. For example, I chose not to add the `-ld`,
`-lm`, and `-ls` flags since they are dependent on `Xwayland`'s
compile-time flags.
