Fixes#670.
Component spec based on https://www.notion.so/emizzle/Wallet-transaction-components-2003b78a8d0d41c4ab3d21eb2496fb20.
Changes the current Select shared component to a model databound component. This means we can bind directly to `QAbstractListModel`'s coming from Nim instead of needing manipulating the data in to javascript objects. The changes to the Select component will be used for the upcoming Asset selector shared component.
Having all the different input types in one file made it simpler to design, but created an issue with memory, because all the aliases, properties and images were created for all types even if you only used a basic Input. I tried using Loaders, but making aliases within loaders is super painful/impossible in some cases.