Implement per client config files

Move the daemon config file loading to a new conf.c file used by
the context to load the configuration. This replaces the module
profiles and some hacks to move properties around.

If there is nothing other specified with $PIPEWIRE_CONFIG_NAME or
a property, the client.conf file is loaded as a fallback.

Update the session manager config file to load the modules via the
config now. Rename the session modules section to another name.

Update pipewire-pulse to also load a specific pulse property file.
This then makes it pssible to assign specific RT priorities for the
pipewire-pulse process.

src/daemon/media-session.d/media-session.conf

@@ -17,6 +17,49 @@ spa-libs = {
 }
 
 modules = {
+    ##  <module-name> = { [args = { <key>=<value> ... }]
+    #                     [flags = [ [ifexists] [nofail] ]}
+    #
+    # Loads a module with the given parameters.
+    # If ifexists is given, the module is ignored when it is not found.
+    # If nofail is given, module initialization failures are ignored.
+    #
+    # Uses RTKit to boost the data thread priority.
+    libpipewire-module-rtkit  = {
+        args = {
+            #nice.level = -11
+            #rt.prio = 20
+            #rt.time.soft = 200000
+            #rt.time.hard = 200000
+	}
+        flags = [ ifexists nofail ]
+    }
+
+    # The native communication protocol.
+    libpipewire-module-protocol-native = null
+
+    # Allows creating nodes that run in the context of the
+    # client. Is used by all clients that want to provide
+    # data to PipeWire.
+    libpipewire-module-client-node = null
+
+    # Allows creating devices that run in the context of the
+    # client. Is used by the session manager.
+    libpipewire-module-client-device = null
+
+    # Makes a factory for wrapping nodes in an adapter with a
+    # converter and resampler.
+    libpipewire-module-adapter = null
+
+    # Allows applications to create metadata objects. It creates
+    # a factory for Metadata objects.
+    libpipewire-module-metadata = null
+
+    # Provides factories to make session manager objects.
+    libpipewire-module-session-manager = null
+}
+
+session.modules = {
     # These are the modules that are enabled when a file with
     # the key name is found in the media-session.d config directory.
     # the default bundle is always enabled.