refactor: big reorgnization of modules

[tlambert03]

finding it harder to find stuff, this reorganizes stuff:

$ tree src/pymmcore_widgets -L 1
src/pymmcore_widgets
├── __init__.py
├── __pycache__
├── _deprecated
├── _icons.py
├── _install_widget.py
├── _util.py
├── config_presets
├── control
├── device_properties
├── experimental.py
├── hcwizard
├── mda
├── py.typed
├── useq_widgets
└── views

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 86.92308% with 17 lines in your changes missing coverage. Please review.

Project coverage is 90.63%. Comparing base (426baf2) to head (e4b6f9c). Report is 25 commits behind head on main.

Files with missing lines	Patch %	Lines
...core_widgets/device_properties/_property_widget.py	75.36%	17 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #321 +/- ## ========================================== + Coverage 90.58% 90.63% +0.04% ========================================== Files 74 75 +1 Lines 8372 8360 -12 ========================================== - Hits 7584 7577 -7 + Misses 788 783 -5 ```

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