Set the plugin name as the object name

This uses the objectName to store the untranslated name of the plugin.
This can be useful when specifying specific plugins using API, without
requiring additional data members. Also set the parent to the factory's
parent by default.

Change-Id: I2e99210911da32e57ea9a6a89f8f730a5f65eaa7
Merge topic 'set-plugin-name' into master

d1d9823a Set the plugin name as the object name