[Icons] `Icon` changes

[kbond]

trafficstars

Q	A
Bug fix?	no
New feature?	no
Issues	n/a
License	MIT

1. Removed Serializable from Icon (this isn't needed unless I'm mistaken)
2. I moved Icon up a level (this is a personal preference). @smnandre did you have plans for more classes in the Svg namespace?

[smnandre]

2. I moved Icon up a level (this is a personal preference). @smnandre did you have plans for more classes in the Svg namespace?

Yes, but we will see when it happens. 100% support on this move right now.