Albert v0.21.1 released

[albert]

• Add cmd/ctrl + number tab navigation in settings
• Automatically add hpp and qml files to plugin projects

[plugins]

• [docs:1.2] Polish. Fix #106
• Fix misleading comment in config widget

[python]

• [stub] Add missing imports to stub file
• [tex_to_unicode] Fix crash due to wrong type annotation
• [emoji] Fix #179. Call cacheLocation as method of self.

Check the GitHub repositories for details.