refactor to mautrix 0.17.x; update deps

vendor/maunium.net/go/mautrix/crypto/goolm/main.go

@@ -0,0 +1,6 @@
+// Package goolm is a pure Go implementation of libolm. Libolm is a cryptographic library used for end-to-end encryption in Matrix and written in C++.
+// With goolm there is no need to use cgo when building Matrix clients in go.
+/*
+This package contains the possible errors which can occur as well as some simple functions. All the 'action' happens in the subdirectories.
+*/
+package goolm