So that when there is an error tracebacks can be shown in new
versions of browsers.

We had an issue related to re-initializing the plugins when they've
already be initialized, this ended up re-registering the same plugin
functionality and thus would result in getting duplicated sections
and potentially other issues.

While re-initialization of plugins should be avoided altogether, the
logic for initializing them should make sure the plugins and their
states are reset before initialization which is what this patch does.

The lib.ts file should carry the bits to be used by plugins whereas
the index.ts should have the functions that Headlamp itself needs for
loading the plugins.