Added snd_config_hook_load_for_all_cards.

Added private_data parameter for snd_config_hooks function.
Fixed the return value mess in the config parser routines.
The include file could begin with 'confdir:' which is replaced with /usr/share/alsa.
The snd_config_search_definitions looks for raw name at first (without suggested root).
Added snd_func_private_card_strtype function.
All configuration files moved to the src/conf directory.
Configuration files modified to use load-on-demand feature using hooks.

src/conf/pcm/front.conf

@@ -0,0 +1,47 @@
+#
+# Hardware output from front speakers
+#
+
+pcm.!front {
+	@args [ CARD DEV ]
+	@args.CARD {
+		type string
+		default {
+			@func getenv
+			vars [
+				ALSA_FRONT_CARD
+				ALSA_PCM_CARD
+				ALSA_CARD
+			]
+			default {
+				@func refer
+				name defaults.pcm.front.card
+			}
+		}
+	}
+	@args.DEV {
+		type integer
+		default {
+			@func igetenv
+			vars [
+				ALSA_FRONT_DEVICE
+			]
+			default {
+				@func refer
+				name defaults.pcm.front.device
+			}
+		}
+	}
+	@func refer
+	name {
+		@func concat
+		strings [
+			"cards."
+			{
+				@func card_strtype
+				card $CARD
+			}
+			".pcm.front." $DEV ":CARD=" $CARD
+		]
+	}
+}