Add procfs fallback for figuring out the cwd

Opening a terminal or file manager window requires weltschmerz to know
the current working directory. At the moment weltschmerz relies on the
application being run in the terminal to generate OSC 7 codes that
specify the path. However, OSC 7 is not yet widely supported by default,
and the VTE terminal emulation layer, which manages the OSC 7 path state
for weltschmerz, will overwrite local paths with ones that point to a
remote computer if an OSC 7 enabled application is run under ssh.

This change adds a fallback that uses the symlink to current working
directory located at /proc/<child pid>/cwd. On Linux this method should
always work and was how these features were implemented before adoption
of OSC 7. The procfs method is used as a fallback instead of the primary
method since it can only see the working directory changes of the direct
child process.

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