Alternatives to the MemorizingTrustManager

[stokito]

It looks like a lot of PRs and issues aren't processed yet. I see that contributors or Smack XMPP client, DAVx5 and Conversations all used the MTM but switched to own solutions

• The DAVx5 author created the cert4android and switched to it bitfireAT/davx5-ose@b73a825
• The Conversations app (and its countless forks) has the MTM included with some changes https://github.com/LibreMessenger/Libre-Messenger/blob/master/src/main/java/de/pixart/messenger/services/MemorizingTrustManager.java The same author also developed FairMail so I guess it's used there too.
• The Smack is used by the Yaxim, Xabber, aTalk but also the Spark client for a desktop. And the Spark has a very extended settings for certs including mutual auth. But it's outdated and has a bug which not fails the LetsEncrypt cert chain.

So I decided to find some trust manager with similar features that already in production use and came to your repo.
So my question is: could you check PRs and collect all the changes to make the MTM to be the "standard" trust manager? The current situation is dangerous because due to fragmentation we have to fix bugs, add features, translate and reinvent the wheel again and again. Having the same lib for both Java and Android would be also great.