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Your task

Add one more option to audio configuration: right now you can turn off sound completely or just turn off the music. Implement the possibility of turning off only sound effects while leaving music on. See QTfrontend/ui/page/pageoptions.cpp and hedgewars/uSound.pas where (most of) such options are configured.

Deliverables: A working patch, that applies cleanly to our source tree. This patch should be in the form of a pull from clone, hg export or unified diff format (in order of preference) implementing the functionality required.