0.2.5

Fixes the following issues:

• fixes CLI @berombau @LucaMarconato
• fixes display of points and circles @LucaMarconato
• fixes issue with name reinitialization @tothmarcella
• revert to use PyQt5 @melonora
• RGB/RGBA correctly displayed for 3/4 channel images @rahulbshrestha
• layer visibility changes when changing coordinate system @melonora
• fixes performance with multiscale images @LucaMarconato
• refactor internal code to prepare for future refactoring @melonora

Thanks to the reviewers @giovp @timtreis @kevinyamauchi and the users that reported bugs.