daemon: Rename dring occurrences in code and file names to jamid.

Automated using the following commands:

  $ mv src/{dring,jami}
  $ git grep -l src/dring | xargs sed -i 's,src/dring,src/jami,g'
  $ git grep -l '#include "dring/' | \
    xargs sed -i 's,#include "dring/,#include "jami/,g'
  $ git grep -l 'dring.h' | xargs sed -i 's,dring.h,jami.h,g'

And finally,

  $ git grep -l 'dring' | xargs sed -i 's,dring,jami,g'

  $ files=$(find -name '*dring*' | sort)
  $ for f in $files; do mkdir -p "$(dirname "$f")"; \
      mv "$f" "$(echo $f | sed 's/dring/jami/g')"; done

To resolve a bad renaming favorably:

  $ git grep -l -i AlsaCarjami | \
    xargs sed -i -E 's/([Aa])lsaCarjami/\1lsaCardRingtone/g'

The above renaming command is not perfect, so some hand-tuning was
required to complete it.

* src/manager.cpp (Manager::ManagerPimpl::retrieveConfigPath):
Preserve the dring.yml configuration file name, until we add something
to migrate (rename) it to jami.yml.
* man/dring.pod: Delete.
* bin/dbus/jamid.pod: Move to ...
* man/jamid.pod: here.
* bin/dbus/meson.build (jamid_targets): Normalize man section to the
pre-existing 1 and adjust accordingly.
* src/jami/def.h (dring_EXPORTS): Rename to ...
(jami_EXPORTS): ... this.

change-Id: I9828be6da9c711ab2f22c4d1b9539fea89d7b6fb