Add address bar parameter support for new element dialog

[CSchmitz81]

The element dialog and user dialog both update the address bar with custom parameters, but the new element dialog doesn't support this yet. This gives a strange experience for uses pressing back and when opening a page to a specific address. The address bar should track the parent element ID as "e" and type ID as "t" (both optional). The "d" parameter should be set to "new" to indicate the type of dialog. If the type is specified, the top bar color should be set accordingly in the new element dialog. This should use the same implementation patterns in ctree-dialogs.html as the other dialog types. This should behave correctly if the browser is refreshed.

[CSchmitz81]

@carloe1 I saw the branch you added for this. Does that mean you plan to continue working on it during the hackathon this weekend?

[CSchmitz81]

@carloe1 are you still working on this or should I release it for someone else to pick up?

[CSchmitz81]

Unassigning due to lack of progress. Check branch #83-adding-parameters-to-new-dialog for work which can be used before doing additional work.

[CSchmitz81]

Review branch #83-adding-parameters-to-new-dialog-url to see if it can be used as a starting point for finishing this.