* Add checksums/supportedTypes and checksums/preferredUploadType
capabilities. The default is that no checksum types are supported.
* Remove the transmissionChecksum config option. Servers must now
use the capabilities to indicate that they are fine with the
client sending checksums.
Note: This intentionally breaks brandings that overrode
Theme::transmissionChecksum. The override must be removed and the
server's capabilities must be adjusted to include the new values.
The isValid check should be used everywhere the capabilities
are used as the loading of the capabilities is happening
in parallel of the startup, so it is not guaranteed to be
available always.
- Remove the copy constructor. The default constructor is fine. Having
a user defined copy constructor inhibit the move constructor.
- Pass QVariantMap arguments via const references
- Do not return a pointer to Capabilities from the account. It is a
value type and should not be used by pointer.
