bluray: Add BD-J settings

Hello,

This add two new options in Blu-ray access module settings:

• Set a specific JRE path (JAVA_HOME) for BD-J content execution. Currently the libbluray checks common Java installation paths and the JAVA_HOME environment variable, which can be problematic with multiple Java installations (environment variable changes). If empty, the default libbluray behavior is used.
• Enable or disable BD-J persistent storage, this is enabled by default (current behavior).

These two new settings are in a "BD-J" section.