Dynamic data loading for modals

[anonymoussprocket]

There is a mechanism already for dynamically loading views for rendering specific registered entities. This needs to be extended in two significant ways.

1. Allow for fine-grained templates where an object registered to render tezos/mainnet/account can load different views for implicit accounts vs baker accounts vs contracts.
2. Allow for additional data enrichment. Currently the registered template receives the data it is expected to show, however more information may be useful in some cases.

Related to PR392.