Mixing tabs + spaces does not get fixed nor raise warning

[torleif]

Is your feature request related to a problem? Please describe. When you have file that contains both tabs and spaces, they both get used

Describe the solution you'd like Keep the usage of tabs or spaces consistent

Describe alternatives you've considered Other extensions have an option to set the number of spaces, or to use tabs

Additional context it's great this extensions works out the box

[TheRealSyler]

@torleif should't be to difficult to implement, i will try to add it to the next version.