Commercial comps tweaks2

This tidies up a load of small issues with Masterclasses and Soulmates.

Widths are now calculated when using 1/3 & 2/3, makes it far better than 33% & 66%.

Mixins made for duplicated code used in Masterclasses component.
Brilliant! Shame on me for not remembering older Androids did not support svg!

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