Prevent some files from being eol converted

Closes #813

Well, hopefully. This hasn't been tested, as I don't have easy access to
Windows.

.gitattributes

@@ -1,3 +1,15 @@
 # Ignore changes in generated files
 src/generated/resources/data/** linguist-generated
 src/test/server-files/structures linguist-generated
+
+* text=auto
+
+*.gradle eol=lf diff=java
+*.java   eol=lf diff=java
+*.kt     eol=lf diff=java
+*.lua    eol=lf
+*.md     eol=lf diff=markdown
+*.txt    eol=lf
+
+*.png binary
+*.jar binary