BF: Optimized plot windows

[detlefarend]

Description/Motivation
The content space of MLPro's plot windows shall be maximized by removing the toolbar and placing its functionalities in a context menu instead. Furthermore, a system for the enrichment of the context menu and the toolbar shall be established.

Task list

• 1 Evaluation
• 2 Redesign/extension of subframework mlpro.bf.plot
  • 2.1 Extension of the backend api
    • Custom toolbar
    • Custom context menu
  • 2.2 Implementation Qt
  • 2.3 Implementation Tk
  • 2.4 New default behavior
    • No toolbar
    • Context menu with standard functions: zoom, pan, save as, ...

Related issues
#...

Cross references
https://chatgpt.com/share/686f6af4-f2b4-8010-be3d-4f03e3be2481