history.js: Properly handle data attributes upon navigation

[nilmerg]

This is required so that attributes like data-icinga-container-id are properly managed if the user navigates using the history buttons. Previously these were not managed at all as applyLocationBar didn't made use of ui.js' capabilities to paste/cut/move contents.

I've rewritten applyLocationBar basically. It now also just moves a column if only the location has changed, not the url.

I will add a comment with test-cases the next days.

[nilmerg]

landing page tests

✔️ redirect to login, col2 state must be preserved and shown after login
✔️ already logged in, only col2 state must be loaded, col1 must be left alone

navigation tests

✔️ on the dashboard, click on three menu items in a row, navigate back three times and check if the order is the same but reversed and the result is the dashboard again

✔️ on the dashboard, directly go to the hosts list and choose a host, navigate back two times and notice the following:

1. the right column closes, the left column is left alone
2. the left column is replaced

✔️ Repeat the same test again, but by navigating forward and notice the following:

1. the left column is replaced
2. the right column is opened

✔️ Stay on the host detail and click on the services tab, navigate back and notice:

1. the left column is replaced

✔️ Now click on the services tab again and choose one, navigate back two times and notice:

1. the left column moves to the right, the left column is loaded
2. the right colum is replaced

✔️ Navigate forward two times now and notice:

1. the left column is replaced by the services tab
2. the right column moves to the left and the service appears in the left column