[3DS] Option to install .CIA title updates and DLCs

[nesper8]

Issue
Many 3DS games often have post launch DLCs and updates which are in the .CIA (CTR Importable Archive) format. Lemuroid at the moment does not have the option to install these .CIA updates and DLCs making many of these game contents and/or bugfixes inaccessible at the moment

Solution
Have a small updates and dlc manager for the Citra core which you can later install these comments later into

Thank you