Trxasprefitpack

What's Changed
Implement GUI wrapper for fit_tscan utility (fit_tscan_gui)


**Full Changelog**: https://github.com/pistack/TRXASprefitpack/compare/v0.7.0.1...v0.7.1

Fix bug in `residual_decay_same_t0`

Example for TRXASprefitpack version 0.6.1 (Improvement of static spectrum fitting routine)