libnm-core, core: move NMManagerError to nm-errors
Move the definition of NMManagerError to nm-errors, register it with D-Bus, and verify in the tests that it maps correctly. NM_MANAGER_ERROR_INTERNAL gets renamed to NM_MANAGER_ERROR_FAILED for consistency. NM_MANAGER_ERROR_UNMANAGED_DEVICE is dropped since that name doesn't really describe the one place it was previously used in. NM_MANAGER_ERROR_SYSTEM_CONNECTION is dropped because it was't being used. NM_MANAGER_ERROR_UNSUPPORTED_CONNECTION_TYPE is dropped because it can be replaced with an NM_CONNECTION_ERROR. NM_MANAGER_ERROR_AUTOCONNECT_NOT_ALLOWED is turned into the more generic NM_MANAGER_ERROR_CONNECTION_NOT_AVAILABLE. Also, remove the <tp:possible-errors> sections from nm-manager.xml, since they were completely out of date.
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