Plugin: optimize polylines/other segments

[KTibow]

This could be added to convertPaths or made into a new plugin

Describe what the plugin should do
Paths can often be optimized by changing their direction.
Base path: M16 14v-2H8v2Z (14b)
Optimized by changing the start: M8 14h8v-2H8Z (13b)
Optimized by reversing direction and changing the start: M8 12h8v2H8z (12b)

Actually this might be a duplicate of #78 but keep in mind that other factors can influence it, like converting to absolute
Implementation

• Are you volunteering to work on this plugin?
  I will try but I might not manage to make something that works properly - this would require somehow separating each segment, trying out each possibility, and converting to mixed.