LQ calibration updates

[erin717]

Added the following updates to the LQ calibration routines:

• Widened the range to use for DEP events
• When performing the time-correction, calculate the arithmetic mean and sigma instead of trying to fit the distributions
• Narrowed the region of drift-time values to use when calculating the drift-time correction
• After performing the cut fit, the LQ values are now normalized by the fitted sigma. The cut value is now set to a default of 3
• Minor changes to make the syntax consistent across all the routines.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 60.41667% with 19 lines in your changes are missing coverage. Please review.

Project coverage is 50.10%. Comparing base (daa9530) to head (8e275d2).

Files	Patch %	Lines
src/pygama/pargen/lq_cal.py	60.41%	19 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #577 +/- ## ========================================== + Coverage 50.05% 50.10% +0.04% ========================================== Files 63 63 Lines 7581 7596 +15 ========================================== + Hits 3795 3806 +11 - Misses 3786 3790 +4 ```

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