The new formatter was ignoring selected headers, always displaying
only From, To, Subject and Date (default headers).
Handling of the currently displayed headers has been moved to
EMailConfigFormatHTML extension, because it is related to
configuration of EMailFormatter, rather then EMailReader.
All mail-parsing and formatting code has been moved to em-format.
Parsing is handeled by EMailParser class, formatting by EMailFormatter.
Both classes have registry which hold extensions - simple classes
that do actual parsing and formatting. Each supported mime-type
has it's own parser and formatter extension class.
These libraries are bound for E-D-S so they live at the lowest layer of
Evolution for now -- even libeutil can link to them (but please don't).
This is the first step toward moving mail handing to a D-Bus service.
More mail API churn... reversing some previous API decisions.
I've made some key API changes to EMailSession on the account-mgmt
branch which should allow for this, and will hopefully also benefit
the "email-factory" branch.
EMailBackend barely needs to exist anymore, except as the owner of
EMailSession.
For several low-level functions, we replace its EMailBackend parameter
with EMailSession and EAlertSink parameters; the latter so it can still
pass user alerts up the chain.
Means EMailBrowser no longer has to.
Also, EMailReader now provides a default implementation for
get_alert_sink() which just calls get_preview_pane() and casts.
Drop EMFolderTreeModel's "session" property now that it has a "backend"
property and call em_folder_tree_model_set_backend() where we used to
call em_folder_tree_model_set_session().
The session can still be obtained through e_mail_backend_get_session().
