Add stable IDs to the plugin's enum parameters

Existing instances will automatically be upgraded to these IDs when the
instance gets saved. This makes it possible to rearrange things later
when needed.

plugins/crisp/src/lib.rs

@@ -102,10 +102,13 @@ struct CrispParams {
 #[derive(Enum, Debug, PartialEq)]
 enum Mode {
     /// RM the entire waveform.
+    #[id = "soggy"]
     Soggy,
     /// RM only the positive part of the waveform.
+    #[id = "crispy"]
     Crispy,
     /// RM only the negative part of the waveform.
+    #[id = "crispy-negated"]
     #[name = "Crispy (alt)"]
     CrispyNegated,
 }
@@ -114,8 +117,10 @@ enum Mode {
 #[derive(Enum, Debug, PartialEq)]
 enum StereoMode {
     /// Use the same noise for both channels.
+    #[id = "mono"]
     Mono,
     /// Use a different noise source per channel.
+    #[id = "stereo"]
     Stereo,
 }