Reimplement most of the tool:

Most of the tool has been reimplemented, with the exception of the
permission editing feature, which is currently half implemented. There
are also several TODOs spread around that would benefit from some action

example-config.toml

@@ -0,0 +1,7 @@
+# This should go to `/etc/mysqladm/config.toml`
+
+[mysql]
+host = "localhost"
+posrt = 3306
+username = "root"
+password = "secret"