Launch the trip summary editor from a side metabox, instead of the current WP editor button and also add relevant trip summary status information to that metabox

[alexboia]

Is your feature request related to a problem? Please describe. The problem with the current way of opening the trip summary editor is two-fold:

• one, that you cannot see whether or not there is some trip summary data for the post we are currently editing;
• two, that the current button that is being used is only being displayed for the classic editor (since it is bound to the media_buttons hook).

Describe the solution you'd like The proposed solution is to manage the trip summary data using a metabox on the side that would include:

• status information (whether or not trip summary information and/or track data exists);
• quick action buttons: clear track data, clear trip summary information;
• a button to launch the editor.

[alexboia]

Plugin no longer attaches the form itself to the edit_form_after_editor hook, because that's not available on the block editor. Instead, it is register along with the metabox, right before it, since it's a hidden element, that's only shown as an overlay window.