The initial working directory of a new window may be set by a
`-cd directory` option. However, the `-cd directory` option is
not capable of handling paths with spaces when used via wctl.
To enable paths with spaces the function
/sys/src/cmd/rio/wctl.c:/^parsewctl is extended to handle quoted
directory paths.
Before applying the patch the following will fail to open a new
window by writing to /dev/wctl:
<snip>
% rio -i window
% mkdir '/tmp/path with space'
% echo new -cd '''/tmp/path with space''' window -x rc >> /dev/wctl
% pwd
/tmp/path with space
<snap>
The following invocation fails as well:
<snip>
% window -cd '/tmp/path with space'
% pwd
/tmp/path with space
<snap>
After applying the patch the above sequences work as expected,
opening a window running rc with the working directory set to
'/tmp/path with space'.
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