Error: Detected unknown package 'espressif8266'

[probonopd]

PlatformIO 4.3.4 (last one in the 4 series which we were using):

PlatformManager: Installing espressif8266 @ 2.0.0
Error: Detected unknown package 'espressif8266'

Why?

[probonopd]

According to this:

Hi Sebastian (2021.05.18_10:34:31_-0400)
Upstream changed paths for the framework manifest files in recent
releases and did not maintain backward compatibility links resulting
in 4.3.4 no longer being able to install the frameworks.

Such breakages suck and take the fun out of open source development!

[probonopd]

...and sure enough, when we use PlatformIO 5.1.1 then espressif8266 can be installed (again) but now other stuff is broken...

[common] now must be called [env] apparently. This is what I dislike about having to upgrade stuff all the time. What was working before is no longer working due to random changes like this. Argh!