Add scalafmt and .editorconfig

Author: Sven Behrens

.editorconfig

@@ -0,0 +1,15 @@
+# http://editorconfig.org
+
+root = true
+
+[*]
+charset = utf-8
+indent_style = space
+indent_size = 2
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.md]
+insert_final_newline = false
+trim_trailing_whitespace = false

.scalafmt.conf

@@ -0,0 +1,27 @@
+version = "3.8.1"
+
+runner.dialect = scala213
+
+preset = defaultWithAlign
+
+maxColumn = 120
+
+assumeStandardLibraryStripMargin = true
+
+align {
+  arrowEnumeratorGenerator = true
+}
+
+newlines {
+  penalizeSingleSelectMultiArgList = true
+}
+
+rewrite {
+  rules = [Imports, PreferCurlyFors, RedundantParens]
+  imports.sort = scalastyle
+}
+
+docstrings.wrap=no
+
+// only format files tracked by git
+project.git                               = true

project/plugins.sbt

@@ -1,6 +1,7 @@
-addSbtPlugin("com.github.sbt" % "sbt-ci-release" % "1.5.12")
-addSbtPlugin("com.typesafe" % "sbt-mima-plugin" % "1.1.3")
-addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.16.0")
+addSbtPlugin("com.github.sbt"     % "sbt-ci-release"           % "1.5.12")
+addSbtPlugin("com.typesafe"       % "sbt-mima-plugin"          % "1.1.3")
+addSbtPlugin("org.scala-js"       % "sbt-scalajs"              % "1.16.0")
 addSbtPlugin("org.portable-scala" % "sbt-scalajs-crossproject" % "1.3.2")
-addSbtPlugin("org.scala-js" % "sbt-jsdependencies" % "1.0.2")
-addSbtPlugin("io.get-coursier" % "sbt-shading" % "2.1.4")
+addSbtPlugin("org.scala-js"       % "sbt-jsdependencies"       % "1.0.2")
+addSbtPlugin("io.get-coursier"    % "sbt-shading"              % "2.1.4")
+addSbtPlugin("org.scalameta"      % "sbt-scalafmt"             % "2.5.0")