Allow icon use file name and data:image/svg

[ououn]

Detailed description of your suggestion

Allow plugin action use file name as icon, ex: icon: 'file_name.png'
rn this is possible for plugin icon, but not action icon.

Allow plugin and action to use icon: 'data:image/svg+xml'.

[JannisX11]

Not planned as introducing additional dynamic files is not supported by the plugin system.