Remove abstraction from windowing procedure

[bch0w]

What does this PR do?

Motivation:

• Removes abstraction from the Manager window function.
• Previously, User's provided an argument to window(fix_windows: bool) to determine whether windows were selected, or re-used (from an ASDFDataSet). This was a bit too abstract
• To be more explicit, the window() function only selects windows. A new function retrieve_windows_from_dataset is used in lieu of the window function in order to retrieve windows from a previous evaluation

Changelog:

• Function Manager.window() is now only used for selecting new windows
• Function Manager.retrieve_windows_from_dataset() is now used for selecting previously evaluated windows from an ASDFDataSet
• Feature: Can now retrieve window by component, previously all windows in Dataset were returned
• Adjusted Manager.flow function to deal with new setup
• Misc Bugfix: Remove 'simple' detrend from preprocessing steps because it was causing processing artefacts on non-tapered data
• Misc: function format_event_name can now handle all events output by PySEP's read_events_plus

Why was it initiated? Any relevant Issues?

• Setting up for Pyatoa to be able to used manually selected windows by Users. This will come in a future PR
• And to remove some obscurity from the processing workflow

PR Checklist

• [x] develop base branch selected?
• [x] This PR is not directly related to an existing issue (which has no PR yet).
• [x] All tests still pass.
• [x] Any new features or fixed regressions covered by new tests.
• [ ] Any new or changed features have been fully documented.
• [ ] Significant changes have been added to CHANGELOG.md.
• [ ] First time contributors have added your name to CONTRIBUTORS.txt .