Add option to disable crypt reply selection
* src/addin-options.cpp: Update accordingly. * src/dialogs.h, src/dialogs.rc: Add new option. * src/mailitem-events.cpp (EVENT_SINK_INVOKE): Handle option. * src/main.c (read_options, write_options): Handle new option.
There are some usecases e.g. when using an encryption gateway
where choosing the reply crypto state based on the original
message might not be welcome. So make it optional.