archrelease: support subdirectories in package directories

We need to support subdirectories for the `keys` directory used to
distribute PGP keys alongside the packaging sources.

This is achieved by using `svn ls` to list the files and directories
in the packaging root and leverage the behavior of `svn copy` to
consider subdirectories inside the root but only copy over files and
directories under the subdirectory that are already tracked by svn.
As a step in between, we now use `svn ls --recursive` to list all
tracked svn files in the current repos directory and remove all tracked
files in the staging area. Hence the `svn copy` in combination with the
`svn rm` will result in a sync behavior from the packaging root to the
repos directory.

Signed-off-by: Levente Polyak <anthraxx@archlinux.org>

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