v2.5.0

DO NOT USE - USE v2.5.1 INSTEAD!!

Better file picker, add Mac release, voltage snapping in the wave generator controls, and other minor fixes!

## Files
* Whoa-Scope.exe: Whoa-Scope for Windows
* Whoa-Scope: Whoa-Scope for Linux
* Whoa-Scope for MacOS coming soon!

## Changelog
* @happysmaran added usage of the system file picker!
* @happysmaran added voltage snapping in the wavegen controls!
* Narrow scope plot so that the horizontal cursor label is visible (#6)
* Hide tooltips when switching screens (#5)
* Improved cursor visibility on some themes