v1.2.0 Relases

Key Changes:

1. Added five basic icons: number, unordered list, empty checkbox, half done, etc.
2. Provided a hot key to open the icon picker.
3. Enabled setting an icon via command even if there is already text on the current line.
4. Enabled changing an icon via command even if an icon is already set on the current line.
5. Allowed customization of the trigger.

Full Changelog: 1.1.0...1.2.0