This allows users to send a canned message to a channel directly from a companion radio without using the app.
This is useful for when using the radio standalone and when testing with multiple radios.

This PR includes changes the necessary changes from #1032. I'd prefer if #1032 went in separately.
Implementation is hidden behind a build flag that I've enabled only for the Heltec T114 for now.
The set of messages is hard coded.

Usage:
When on the page, long press/Enter to enter the Quick Messages screen.

• double click/Left moves between fields.
• single click/Right cycles forward through the values.
• triple click cycles backward through the values.
• single click on "[send]" will send the message to the selected channel.
• long press will exit the Quick Messages screen.
• If GPS is enabled, one of the message options will be to send your current position.

Tested on T114.

Future ideas:

• allow message set to be configured from the app.