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/client.conf.in

@@ -0,0 +1,53 @@
+# Daemon config file for PipeWire clients version @VERSION@ #
+
+properties = {
+    ## Configure properties in the system.
+    #mem.warn-mlock =		false
+    #mem.allow-mlock =		true
+    #mem.mlock-all =		false
+    #log.level =		2
+}
+
+spa-libs = {
+    ## <factory-name regex> = <library-name>
+    #
+    # Used to find spa factory names. It maps an spa factory name
+    # regular expression to a library name that should contain
+    # that factory.
+    #
+    audio.convert* = 	audioconvert/libspa-audioconvert
+    support.* =		support/libspa-support
+}
+
+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.
+    #
+
+    # 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
+}