use notification system for existing systems

[tonoizer]

Issue description

Describe your issue in detail here

Now that we have a notification system, we can integrate it into our existing system i.e.

• successfully created a capture area
• sucessfully started screen capture
• display information when needed
• display warnings and errors if something did occour

Definition Of Ready (DoR)

This issue can be worked on if

• a developer is assigned
• the issue is labeled
• the issue is assigned to the current sprint
• the issue is estimated
• a meaningful title has been set
• the issue is described in detail
• Depends on Update how the snackbars are displayed from notification system #130