Interactive tool improvements

[kmnhan]

Adds imagetool crop functionality and a new qshow.params accessor to visualize fit parameter evolution.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 92.17970% with 47 lines in your changes missing coverage. Please review.

Project coverage is 81.60%. Comparing base (2c41bb1) to head (91c6600). Report is 25 commits behind head on main.

:white_check_mark: All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/erlab/interactive/imagetool/dialogs.py	92.57%	19 Missing :warning:
src/erlab/accessors/general.py	88.15%	9 Missing :warning:
src/erlab/io/dataloader.py	63.63%	8 Missing :warning:
src/erlab/interactive/imagetool/core.py	94.04%	5 Missing :warning:
src/erlab/interactive/imagetool/manager.py	96.10%	3 Missing :warning:
src/erlab/interactive/imagetool/controls.py	90.00%	2 Missing :warning:
src/erlab/interactive/imagetool/slicer.py	85.71%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #67 +/- ## ========================================== + Coverage 81.14% 81.60% +0.46% ========================================== Files 66 67 +1 Lines 11332 11630 +298 ========================================== + Hits 9195 9491 +296 - Misses 2137 2139 +2 ```

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