Feature/several small fixes

[dukeofharen]

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

What is the current behavior?

Issue Number: N/A

What is the new behavior?

• When using the "response body form helper" and the type is changed, the type is now immediately changed in the stub contents.
• Prevent non-numeric fields from being filled in in the hit count in the scenario form.
• When not logged in or authentication is disabled, immediately redirect to requests overview page if the login page is visited.
• Added delay for showing loader.

Does this introduce a breaking change?

• Yes
• No

Other information