chore(kate): Move kate back to "common" as it is cross-platform

- Link Kwrite config with Kate

common/.config/kate/externaltools/Rust%20Fmt%20Full%20File.ini

@@ -0,0 +1,14 @@
+[General]
+actionName=externaltool_RustFmt
+arguments=%{Document:FileName}
+category=Tools
+cmdname=rustfmt-full-file
+executable=rustfmt
+icon=text-x-rust
+mimetypes=text/x-rust
+name=Rust Fmt Full File
+output=Ignore
+reload=true
+save=CurrentDocument
+trigger=None
+workingDir=%{Document:Path}