Draft: Alignment GUI Main window refactor

Description

Change QWidget to QMainWindow. Just Draft ui file, if you like the idea, I can continue with refactor and hook it up to code, not it is just launch able as a preview in designer. There are also lot of unnecessary nested layouts in QMainWindow, which I can clean up.

General design change is that all interactive elements are on one side and the plotting space is bigger. However final design can be changed/adjusted.

Related Issues

relates to #370 (closed)

Type of Change

• Change 1
• Change 2

Potential side effects

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Screenshots / GIFs (if applicable)

Additional Comments

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Definition of Done

• Documentation is up-to-date.