Added scroll stuff to theme

theme/scroll.go

@@ -0,0 +1,19 @@
+package theme
+
+import "git.tebibyte.media/sashakoshka/tomo/artist"
+
+func ScrollGutterPattern (horizontal bool, enabled bool) (artist.Pattern) {
+	if enabled {
+		return sunkenPattern
+	} else {
+		return disabledButtonPattern
+	}
+}
+
+func ScrollBarPattern (horizontal bool, enabled bool) (artist.Pattern) {
+	if enabled {
+		return buttonPattern
+	} else {
+		return disabledButtonPattern
+	}
+}