Russian guided AT missile launcher.
First rotate the lever under the tube rail to left, then insert the tube, rotate the lever to the right to lock the tube.
grab the two hand wheels to aim, then pull the left trigger to shoot.
Click the front leg to tweak height.
Wire effect may tank frame rate.
There can only be one mounted version in each scene.
Due to my unity project issue, the cartridge class is 'Tow missile', so plz don't load it with BGM71 tube.
1.0.0 Added 9M113 in Firearms----->RocketMissileLaunchers.
1.1.0 Added 9M113 Handhold version and Dynamic Guide Wire effect;
