Work on conversion of args parsing to go code

tools/cmd/at/env.go

@@ -0,0 +1,20 @@
+// License: GPLv3 Copyright: 2022, Kovid Goyal, <kovid at kovidgoyal.net>
+
+package at
+
+import (
+	"kitty/tools/utils"
+)
+
+func parse_key_val_args(args []string) map[string]string {
+	ans := make(map[string]string, len(args))
+	for _, arg := range args {
+		key, value, found := utils.Cut(arg, "=")
+		if found {
+			ans[key] = value
+		} else {
+			ans[key+"="] = ""
+		}
+	}
+	return ans
+}