WIP: markdown reader, data migration, 编辑器增强等

pubspec.lock

@@ -113,6 +113,22 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.0.8"
+  extended_text_field:
+    dependency: "direct main"
+    description:
+      name: extended_text_field
+      sha256: "3996195c117c6beb734026a7bc0ba80d7e4e84e4edd4728caa544d8209ab4d7d"
+      url: "https://pub.dev"
+    source: hosted
+    version: "16.0.2"
+  extended_text_library:
+    dependency: transitive
+    description:
+      name: extended_text_library
+      sha256: "13d99f8a10ead472d5e2cf4770d3d047203fe5054b152e9eb5dc692a71befbba"
+      url: "https://pub.dev"
+    source: hosted
+    version: "12.0.1"
   fake_async:
     dependency: transitive
     description:
@@ -214,6 +230,11 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "4.0.0"
+  flutter_localizations:
+    dependency: "direct main"
+    description: flutter
+    source: sdk
+    version: "0.0.0"
   flutter_markdown:
     dependency: "direct main"
     description:
@@ -222,6 +243,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "0.7.7+1"
+  flutter_markdown_plus:
+    dependency: "direct main"
+    description:
+      name: flutter_markdown_plus
+      sha256: "039177906850278e8fb1cd364115ee0a46281135932fa8ecea8455522166d2de"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.0.7"
   flutter_plugin_android_lifecycle:
     dependency: transitive
     description:
@@ -352,6 +381,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "0.2.2"
+  intl:
+    dependency: transitive
+    description:
+      name: intl
+      sha256: "3df61194eb431efc39c4ceba583b95633a403f46c9fd341e550ce0bfa50e9aa5"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.20.2"
   json_annotation:
     dependency: transitive
     description: