Upgrade project to libgdx 1.12.1

.editorconfig

@@ -1,9 +1,18 @@
-
-# EditorConfig is awesome: http://EditorConfig.org
-
+# https://editorconfig.org
 root = true
 
-[*.{java}]
+[*]
+indent_style = space
+end_of_line = lf
 charset = utf-8
+trim_trailing_whitespace = true
 insert_final_newline = true
-indent_style = tab
+
+[*.{java,scala,groovy,kt,kts}]
+indent_size = 4
+
+[*.gradle]
+indent_size = 2
+
+[*.md]
+trim_trailing_whitespace = false