Rename "syntax" package to "lexers"

lexers/stxYaml.go

@@ -0,0 +1,34 @@
+//go:build stxYaml || stxAll
+
+package lexers
+
+func init() {
+	syntaxMap["yaml"] = &lazySyntax{init: func() []byte {
+		return []byte(`filetype: yaml
+rules:
+    - type: "(^| )!!(binary|bool|float|int|map|null|omap|seq|set|str) "
+    - constant:  "\\b(YES|yes|Y|y|ON|on|NO|no|N|n|OFF|off)\\b"
+    - constant: "\\b(true|false)\\b"
+    - statement: "(:[[:space:]]|\\[|\\]|:[[:space:]]+[|>]|^[[:space:]]*- )"
+    - identifier: "[[:space:]][\\*&][A-Za-z0-9]+"
+    - type: "[-.\\w]+:"
+    - statement: ":"
+    - special:  "(^---|^\\.\\.\\.|^%YAML|^%TAG)"
+    - constant.string:
+        start: "\""
+        end: "\""
+        skip: "\\\\."
+        rules:
+            - constant.specialChar: "\\\\."
+    - constant.string:
+        start: "'"
+        end: "'"
+        skip: "\\\\."
+        rules:
+            - constant.specialChar: "\\\\."
+    - comment:
+        start: "#"
+        end: "$"
+        rules: []`)
+	}}
+}