Adds set_flag(FLAG_RESIZE_DISABLED, true) to ConfirmationDialog and
AcceptDialog instances which only contain plain content. Dialogs
with content that could leave the borders of the dialog were kept
as resizable.
The flag is set explicitly at dialog creation time, instead of the
previous auto-detect approach. In cases of uncertainty, the dialog was
left as resizable.
This allows removing it from `class_db.h`, significantly reducing the amount of files
that include it transitively.
Also includes some include cleanup in `control.h` and `rich_text_label.h` done while
ensure they don't depend on `callable_mp`.
João Diniz
Michael Alexsander
Danil Alexeev
Rémi Verschelde
Thaddeus Crews
Break
Pāvels Nadtočajevs
A Thousand Ships