Added very basic theme support

[OLef1air]

This adds theme support, which is currently very rudimentary, but can be extended later.
The MLP theme is still the standard theme.

[botwillacceptanything]

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[botwillacceptanything]

👍

[OLef1air]

👍

[coveralls]

Coverage remained the same at 27.72% when pulling 2765843 on OLef1air:AntiPonyGoggles into 24fccf0 on botwillacceptanything:master.

[samis]

👍

[timweightman]

👍 Does look good, thanks for this!

[dbpokorny]

👍

[vifino]

👍

[botwillacceptanything]

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👍 The vote passed! This PR will now be merged into master.

---

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👍: 6 (100%)
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• 🐒 @coveralls

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