more name hint interace updates

- add long card name to device description
- create empty PCM plugin to allow right hint description parsing
- reorder devices in alsa.conf
- make namehint more configurable (using default.namehint.showall switch)
- add two levels basic and exteded for hints to default configuration files
- do not show direct device aliases
- removed all known memory leaks

src/conf/pcm/iec958.conf

@@ -52,21 +52,31 @@ pcm.!iec958 {
 		# fs=48000Hz, clock accuracy=1000ppm
 		default 0x02
 	}
-	@func refer
-	name {
-		@func concat
-		strings [
-			"cards."
-			{
-				@func card_driver
-				card $CARD
-			}
-			".pcm.iec958." $DEV ":"
-			"CARD=" $CARD ","
-			"AES0=" $AES0 ","
-			"AES1=" $AES1 ","
-			"AES2=" $AES2 ","
-			"AES3=" $AES3
-		]
+	type empty
+	slave.pcm {
+		@func refer
+		name {
+			@func concat
+			strings [
+				"cards."
+				{
+					@func card_driver
+					card $CARD
+				}
+				".pcm.iec958." $DEV ":"
+				"CARD=" $CARD ","
+				"AES0=" $AES0 ","
+				"AES1=" $AES1 ","
+				"AES2=" $AES2 ","
+				"AES3=" $AES3
+			]
+		}
+	}
+	hint {
+		show {
+			@func refer
+			name defaults.namehint.basic
+		}
+		description "IEC958 (S/PDIF) Digital Audio Output"
 	}
 }