DevTool: Use different exclusion settings for different Wix FS files

This also adds the WebMP Skins and Plugins folder to the exclusion list, so that
we don't accidentally ship skins or plugins in the installers.
WebMP: Don't use album player if a video-enabled streaming profile is chosen (fixes #366)
WebMP: Disable stream authentication when authentication is disabled
WebMP installers: Create Skins and Plugins folders