This generalises the approach used to execute the flag watcher and
background sync, provides a high-level means of managing local and remote
operations, and provides a means of compartmentalising operation-specific
code.
* src/engine/imap-engine/imap-engine-account-operation.vala
(AccountProcessor): Interface for denoting classes that implements some
account-specific operation.
* src/engine/imap-engine/imap-engine-account-processor.vala
(AccountProcessor): Class to manage the operation queue and execute
operations.
* src/engine/imap-engine/imap-engine-generic-account.vala
(GenericAccount): Create and manage an instance of AccountProcessor,
add queue_operation method to allow operations to be queued.
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