Add a visual gear for drawing circles. Intent is to allow specifying areas on map for lua scripts (such as to indicate a location to go to). Could also be used to, say, circle a hog in CTF. Also add a "Critical" flag for visual gears so a gear flagges as such will always be created.

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#include <stdio.h>

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#include "openalbridge.h"

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int main (int argc, int **argv) {

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    openal_init();

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    openal_close();

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    return 0;

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}