Reset video input source #161
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Added an action to reset video source. Useful for frozen/uninitialised camera/video capture etc. I adapted this from a Lua script whch stored the current video input device details, set them to an empty value, waited a short period, then set the values back. I couldn't get this to work reliably in a plugin, so the execution of this action just gets and then immediately sets the source's settings. This seems to work just as well and successfully re-initialises the source.