Mad-gui

Fixing dependency issues and linter issue

v1.0.1-a1.1
update pypi readme

Update PyPi README

Project
- Switch to Python 3.8 for faster dependency resolving
- improve/fix README
- extend documentation

Code
- make it possible to assign 'file types' to a loader, such that the user knows which file types can be opened using this loader
- fix loading of PlotData objects from saved files
- fix window not shown on macOS
- add python-vlc to fix video plot (for synchronization) not showing up -> may have implications for standalone-builds
- fix synchronization mode

Pipeline
- Remove individually installing astroid as prospector works fine again

Full changelog : https://github.com/mad-lab-fau/mad-gui/compare/v0.2.1-beta4...v1.0.0

Potentially fix "pyside2-uic" not found on windows

**Full Changelog**: https://github.com/mad-lab-fau/mad-gui/compare/v0.2.1-beta3...v0.2.1-beta4

When in edit mode instead of moving lines, the plot was shifted. Now fixed.

**1. Bugs**
- Plugin selection dialog showed "Exporter to used" -> changed to "Plugin to use"
- Fixed style of dropdowns
- Previously the border of a RegionLabel could only be changed when first hovering over the label; now it works also if approaching the label "from outside"
- Plotted channels are now the same before and after executing an algorithm

**2. Additions**
- Added example algorithm for analysis of existing labels
- Added example exporter
- Added BaseImporter.file_type to be able to give importer a preferred file name, such that only files of that type are shown when selecting data
- Added typecheck for passing plugins and labels to MainWindow

**4. Readthedocs**
- improved, e.g. includes working examples