add new changelog and resource.

content/changelog/2021.1212/index.md

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+---
+title: '2021.1212'
+date: 2021-12-12
+---
+
+## Achievement
+- Refactor some editor.
+- Not karaoke editor has its own
+- Implement change handler for lyric objects.
+![](res/2021-12-12-20-31-08.png)
+
+## Code quality
+- Rename from "ImportLyricScreen" into "LyricImporter". [karaoke](#934#936@andy840119)
+- Clean up code. [karaoke](#946@andy840119)
+- Remove postfix "Screen" in "KaraokeConfigScreen" class. [karaoke](#941#947@andy840119)
+- Clean up code by hand. [karaoke](#948@andy840119)
+- Update var usage inspections to disallow for built-in types. [karaoke](#966#967@andy840119)
+- Fix "Parameter type can be IEnumerable of T" issue. [karaoke](#968#969@andy840119)
+
+## Editor
+- Make editor sub-screen inherit real screen. [karaoke](#933@andy840119)
+- Make lyric import into editor screen. [karaoke](#932@andy840119)
+- Move lyric editor into individual screen. [karaoke](#931@andy840119)
+- Implement karaoke editor screen. [karaoke](#935@andy840119)
+- Fix missing dependencies not found issue in karaoke editor. [karaoke](#939@andy840119)
+- Implement karaoke skin editor. [karaoke](#942@andy840119)
+- Remove `EditorSubScreen` because seems over-design. [karaoke](#940@andy840119)
+- Remove editor sub screen class. [karaoke](#944@andy840119)
+- Remove un-need menu item. [karaoke](#945@andy840119)
+- Implement all handler for property change in the editor. [karaoke](#954#962@andy840119)
+- Using change handler to replace some `manager`. [karaoke](#957$964@andy840119)
+
+## Utility
+- Implement bindables utils to sync data with two different type of bindable list. [karaoke](#956@andy840119)