internal/rosa: key-value type

This type is used very frequently. The new type is much easier to type and can receive helper methods eventually if needed.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/rosa/hakurei_current.go

@@ -23,4 +23,4 @@ var hakureiSource = pkg.NewTar(pkg.NewFile(
 ), pkg.TarGzip)
 
 // hakureiPatches are patches applied against the compile-time source tree.
-var hakureiPatches [][2]string
+var hakureiPatches []KV