v7.8.0

What's Changed

• feat: add an ability to override CoolProp backend when constructing a Fluid instance (#387)
• build: bump CoolProp from 7.1.0 to 7.2.0 (#386)
• build: bump csharpier from 1.1.2 to 1.2.1 (#382)
• build: update target frameworks (#385)

Full Changelog: v7.7.0...v7.8.0