[Editor] User Settings

[T-rvw]

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• Load user setting file before launching editor.
  • Easy to read and edit in text editor so don't use binary format. Prefer to use text format, such as xml/json/ini/...
• Save user setting every time setting data changed.
  • The file should be placed in local AppData folder, use engine::Path::GetPlatformAppDataPath to get.
• Setting details
  • Languages
  • ThemeStyle
  • Window Size. Or FullScreen