[Player] Fix OpenUri() after changes in commit bea7776

Commit bea7776 introduced a generic mechanism in dlr_task_open_uri_t
where callers are supposed to set the desired operation and URI type in
the stask data struct, but OpenUri() was not updated to do so.

Calls to OpenUri() would then result in calls to
gupnp_service_proxy_begin_action() with a NULL operation in
dlr_device_open_uri(), which would not trigger the callback at all and
ultimately result in the original DBus call to timeout.

Signed-off-by: Emanuele Aina <emanuele.aina@collabora.com>
[Debug] Print the error message on failed tasks, not just the pointer

Signed-off-by: Emanuele Aina <emanuele.aina@collabora.com>
[Build] Fix small typo in the summary at the end of configure.ac

Signed-off-by: Emanuele Aina <emanuele.aina@collabora.com>
[Build] Ship the internal library in a private directory

The libdleyna-renderer-1.0.so library is not really meant for public
consumption and it's just an internal implementation detail.

To prevent any confusion, ship it in a package-specific subdirectory of
the configured libdir.

Signed-off-by: Emanuele Aina <emanuele.aina@collabora.com>
[Task] Use string constant for Open/Set URI

Define string constants for action and parameters, for
Open/Open Next/Set URI API instead of duplicating the strings
parameters.

Signed-off-by: Ludovic Ferrandis <ludovic.ferrandis@intel.com>
[Coding Convention] Fix tabulation

Signed-off-by: Ludovic Ferrandis <ludovic.ferrandis@intel.com>