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and set the account state accordingly.

Closes #288

Without this patch running f.e. `CALLS_GDB=1 _build/run -p sip` will not work.

Closes #294

This should make sure that origins go offline

Otherwise without appending a semicolon explicitly to the macros, emacs
will insist on indentation.

This makes sure we can load the plugins from the build directory.

Closes #229

All the previous commits make sure we don't fail building with these flags.

As caught by compiling with `-Wswitch-default`

As caught by compiling with `-Wswitch-default`

As caught by compiling with `-Wswitch-default`

As caught by compiling with `'-Wshadow`

As caught by compiling with `-Wshadow`

As caught by compiling with `-Wshadow`

As caught by compiling with `-Wmissing-declarations`
by either making functions static, or declaring them in the header.

As caught by compiling with `-Wold-style-definition` and `-Wstrict-prototypes`.

This exports call objects on the session bus:

 $ gdbus monitor --session -d sm.puri.Calls
 …
 /sm/puri/Calls: org.freedesktop.DBus.ObjectManager.InterfacesAdded (objectpath '/sm/puri/Calls/Call/1', {'sm.puri.Calls.Call': {'Inbound': <false>, 'State': <uint32 0>, 'Id': <''>, 'Party': <''>}})
 /sm/puri/Calls/Call/1: org.freedesktop.DBus.Properties.PropertiesChanged ('sm.puri.Calls.Call', {'Id': <'0987654321'>, 'Inbound': <true>, 'State': <uint32 5>}, @as [])
 /sm/puri/Calls: org.freedesktop.DBus.ObjectManager.InterfacesRemoved (objectpath '/sm/puri/Calls/Call/1', ['sm.puri.Calls.Call'])
 $ gdbus call --session --dest sm.puri.Calls --object-path /sm/puri/Calls/Call/1 --method sm.puri.Calls.Call.Hangup

Currenty hangup and accept methods are implemented as well as exposing
the current call state.

Additionally get rid of the /usr/local/stow/calls-git prefix.

This allows starting calls by invoking something like _build/run.

Closes #292

To make it easier to run from the build directory without having to install.

We are requesting xml-stripblanks in gresources.xml and are missing
xmllint without this dependency.