Rename/separate out into app and module

This still needs a lot more work before release. In particular, I have
to figure out what I'm going to do about the `passphrase` option. It's
probably better to both not require it, in which case no signing is done
(only encryption), and to instead allow a path to a file to be
specified.

The other big puzzle would be how on earth to write automated tests for
it... I may end up imitating however Mail::GnuPG is testing itself.

1 files changed, 0 insertions, 157 deletions

diff --git a/LICENSE b/LICENSE
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index f23c229..0000000
--- a/LICENSE
+++ /dev/null
@@ -1,157 +0,0 @@
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