Rename --feature to --features and support TYPST_FEATURES env var (#5523)

crates/typst-cli/src/args.rs

@@ -315,8 +315,8 @@ pub struct ProcessArgs {
 
     /// Enables in-development features that may be changed or removed at any
     /// time.
-    #[arg(long = "feature", value_delimiter = ',')]
-    pub feature: Vec<Feature>,
+    #[arg(long = "features", value_delimiter = ',', env = "TYPST_FEATURES")]
+    pub features: Vec<Feature>,
 
     /// The format to emit diagnostics in.
     #[clap(long, default_value_t)]

crates/typst-cli/src/world.rs

@@ -117,7 +117,7 @@ impl SystemWorld {
                 .collect();
 
             let features = process_args
-                .feature
+                .features
                 .iter()
                 .map(|&feature| match feature {
                     Feature::Html => typst::Feature::Html,