[CommandPad] CommandPad and CompactCommandPad should be merged

They do basically the same thing. The only difference is that the compact version shows only one button and the message configuration in a dialog.

We should merge the two. Benefits are:

• Less duplicated code
• "Continuous Send" feature on both versions, currently it is implemented only for the compact version
• Ability to switch between the two. One could first try out the explicit version and then switch to the compact version to finalize the UI