wino6687/SWEpy: Revised v1.3.0 release

The first 1.3.0 release failed CI due to a weird shared library issue that has resolved itself. This release contains some minor changes in code to make things cleaner but ultimately brings all the same benefits of v1.3.0 with a passing build.

This update comes with the most significant speed gains yet. All of the processing intense tasks are now designed to automatically make use of every available core using a Pool in python. Speed increases are significant over previous versions.

This release also comes with the first iteration of the Analysis module for SWEpy. This module will give users quick access to information like the change in summer length over each pixel in the study area. Or the date of full melt conditions each year per pixel. This module will continue being upgraded and added to throughout v1.3.x