Add disabled support for inline editors
* src/gpgoladdin.cpp (GpgolRibbonExtender::GetIDsOfNames): Map Ids. (GpgolRibbonExtender::Invoke): Dispatch to correct functions. (GpgolRibbonExtender::GetCustomUI): Add UI for this. * src/ribbon-callbacks.cpp (mark_mime_action, get_crypt_pressed): Prepare to be called from explorer context. (get_crypt_pressed): Return False on error. (mime_sign, mime_encrypt): Removed. * src/ribbon-callbacks.h: Add Ids and update prototypes.
The code is disabled for now because sending does not work that
nice. Should be fairly simple to fix though and something for
the future.