Adding support for Scala 2.13

Mostly import changes
Some formatting changes
Runs +test

.scalafmt.conf

@@ -7,7 +7,8 @@ assumeStandardLibraryStripMargin = true
 docstrings = ScalaDoc
 lineEndings = preserve
 includeCurlyBraceInSelectChains = false
-danglingParentheses = true
+danglingParentheses.defnSite = true
+danglingParentheses.callSite = true
 
 align.tokens.add = [
   {