Migrate base & test commands (!ping, !dbget, !dbput)

[Heatmanofurioso]

We need to start migrating commands to the new command system.

In order to do that safely, we should migrate the test command "ping pong", and some existing base commands, so we have a good notion that the bot is working fine and things are up and running.

• ping Sends a ping command, to which the bot responds with pong, showing that it is up and running.
• dbget Gets a previously saved command in the key value database
• dbput Stores a command in the key value database