Refactor page content generators

CHDataManagement/Generator/Commands/CommandProcessor.swift

@@ -0,0 +1,18 @@
+
+protocol CommandProcessor {
+
+    static var commandType: CommandType { get }
+
+    var results: PageGenerationResults { get }
+
+    init(content: Content, results: PageGenerationResults, language: ContentLanguage)
+
+    func process(_ arguments: [String], markdown: Substring) -> String
+}
+
+extension CommandProcessor {
+
+    func invalid(_ markdown: Substring) {
+        results.invalid(command: Self.commandType, markdown)
+    }
+}