Frbgui

This release adds a module `arrivaltimes` that can be used to perform sub-burst slope measurements of FRBs using the arrival time of the pulse in each frequency channel. This was primarily written to handle ultra-FRBs (FRBs with durations on the order of μs) but works for FRBs in general.

This module is meant for scripting and is mostly independent of the GUI.

* **Paper**: "High precision spectro-temporal analysis of ultra-fast radio bursts using per-channel arrival times", https://arxiv.org/pdf/2412.12404. Includes a description of the method as well as measurements of hundreds of bursts.
* **Documentation**: https://frbgui.readthedocs.io/en/latest/documentation/doc-arrivaltimes.html

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**Full Changelog**: https://github.com/mef51/frbgui/compare/v0.10.0...v0.11.0

What's Changed
* Added tutorials and documentation available at https://frbgui.readthedocs.io/en/latest/
* First tutorial describes how FRB data can be loaded and prepared and should be a good introduction for anyone wanting to work with FRB data, with or without FRBGui
* Second tutorial describes how to perform measurements in FRBGui using two different FRBs.
* Output csv columns are now documented (thanks to Dr. Sofia Sheikh for starting and filling most of the table)
* Faster fit finding by using the previous fit found as the initial guess for the next DM
* update the starting parameter (p0) to fit the 2D Gaussian. by aishk07 in https://github.com/mef51/frbgui/pull/25
* Major rewrite to update to DearPy Gui 1.9.2 (https://github.com/mef51/frbgui/commit/8fe1409d75e540be82ebc60851faf90265f09ad5). This was necessary for running on newer apple silicon machines and for future maintainability as the previously used version of DearPy Gui (0.6.415) is undocumented and unmaintained.
* Remove research files to separate repository
* Normalize data when finding fits
* Quality of Life fixes for Masking and Burst Regions:
* Can now mask after downsampling
* Adding regions will default to "Burst" after the "Background" is specified and will start at the end of the previous region by default

New Contributors
* aishk07 made their first contribution in https://github.com/mef51/frbgui/pull/25

**Full Changelog**: https://github.com/mef51/frbgui/compare/v0.9.2...v0.10.0

- Improve startup documentation
- Resolve startup issues with `npz` files