Add knowncontacts plugin

See merge request !53

This is new plugin that can sync contacts written to ini files. It
ensures that the contacts are not synced to any cloud services.

buteo-sync-plugins-social] Support for multiple users. Fixes JB#47618

See merge request !51

Removes hardcoded user home directory.

[buteo-sync-plugins-social] Create local directory for dir listing requests. Fixes JB#47855

See merge request !49

The dir listing operation saves the list into a local directory.
Ensure the local directory exists before writing into it.
(Previously this was only done for download/upload requests, but
should be done for dir listings as well.)

[buteo-sync-plugins-social] Fetch backup configuration from...

See merge request !48

Do this instead of fetching config values from dconf.

[buteo-sync-plugins-social] Use SyncToken for Google Calendar delta sync. Contributes to JB#44316

See merge request !47

Previously, we used updatedMin timestamp "since" anchor to fetch
changes since last sync.  This commit updates the plugin so that
it uses the "sync token" which Google provides, so that we can
more accurately fetch changes since the last sync, and avoid
the "updatedMin too far in the past" problem which can be hit in
certain circumstances.

We store the sync tokens as account settings, as mkcal doesn't
allow arbitrary metadata to be stored for notebooks.

[license] Fix license short name in spec. Contributes to JB#45486

See merge request !45

[buteo-sync-plugins-social] Support 'list' and 'sync' operations in Dropbox...

See merge request !46

[buteo-sync-plugins-social] Support 'list' and 'sync' operations in Dropbox and OneDrive backups. Contributes to JB#47080

- 'list' operation does a directory listing and saves this to a file
- 'sync' operation does upload/download as per existing sync
  implementation

[buteo-sync-plugins-social] Remove deprecated media_info usage. Contributes to JB#46090

See merge request !44

Dropbox has deprecated media_info in list_folder requests.
This commit removes our usage of media_info from list_folder requests,
and replaces the image width/height metadata we store with placeholder
values.  Those are eventually exposed (by libsocialcache) as
photoWidth/photoHeight to QML, but are not currently used.

Store the google calendar id to SharedWith field

See merge request !42

[buteo-sync-plugins-social] Fix EX/RDATE parsing. Contributes to JB#46011

See merge request !43

RFC5545 states that the valid formats for RDATE are:
RDATE ";" "VALUE" "=" ("DATE-TIME" / "DATE" / "PERIOD") ":" <value>
RDATE ";" "TZID" "=" [tzidprefix] paramtext ":" <value>

Whereas our parsing code incorrectly omitted "VALUE=" prefix handling.

[buteo-sync-plugins-social] Fix include path

See merge request !39

[buteo-sync-plugins-social] Store the google calendar id to SharedWith field. Contributes to JB#45600

[google-contacts] Remove unused dependency on qtcontacts-private

See merge request !38

[buteo-sync-plugins-social] Fail build on undefined symbols

See merge request !37

[buteo-sync-plugins-social] Sync multiple notes to Google Contacts. Contributes to JB#14734

See merge request !36

[buteo-sync-plugins-social] Don't link against QtGui. Contributes to JB#36025

See merge request !32

Most sync plugins don't need to link against QtGui, so remove that
linkage from the common.pri.  Only those plugins which use QImage
need to link against QtGui.

[buteo-sync-plugins-social] Upsync calendar event alarms. Contributes to JB#33108

See merge request !35

The quantization is now done in nemo-qml-plugin-calendar for UI
display, so this avoids spurious changes to user data.

Previously, if a reminder alarm was specified for a calendar event,
we did not upsync to it Google.  This commit ensures that reminder
alarms are upsynced.

It also ensures that we upsync and downsync multiple alarms if those
are specified, rather than just one.

[sociald] Remove unused version numbering. Contributes to JB#38551

See merge request !34