Remove not applicable attributes

[KTibow]

Is your feature request related to a problem? Please describe.
Some attributes have no effect on the content. These can be removed to decrease file size.

Describe the solution you'd like
Remove these attrs if they have no effect (this is a dynamic list and can be updated by me/maintainers):

• color
• fill-rule or clip-rule (see Remove fill-rule #1211)
• stroke-miterlimit (see Strip stroke-miterlimit if stroke-width & path angles not enough to change rendering #1037)

Describe alternatives you've considered
Manually do it

Additional context
Some may require checking for other things, like if currentColor is used