Egon gun sometimes keeps playing run sound after stopping

[SamVanheer]

The Egon gun sometimes keeps playing the run sound after stopping.

This happens due to multiple run sounds being played at the same time; instead of having a sound that loops on its own, it is looped manually in code, which causes some overlap.

To fix this, see this change: https://github.com/SamVanheer/HLEnhanced/blob/19396936af13e417e7f9eaf48c48c49699da03fb/game/client/ev_hldm.cpp#L1378

[SamVanheer]

This bug is caused by the same thing as #1621. A rounding error creeps in sometimes that causes the client to get an fuser1 value of 0 while the server has something like 0.00002. On the client side the event fires, on the server side it does once fuser1 becomes <= 0 at which point the client does it again because it's getting another fuser1 value <= 0.

Note that the timing issues also seem to cause the idle animation to not play when the weapon stops firing. There is currently a 2 second delay before weapon idle runs the idle animation part, but even with that fixed this rounding issue causes it to break sometimes.