New Command: 2049 - SetGameSpeed

[jetrotal]

Minor experiment, our first new Event Command.

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To use it, write in Maniacs TPC: @raw 2049, "", speedIsVar, speed, speedLimitIsVar,speedLimit, hideSpeedMultiplierIsVar, hideSpeedMultiplier

e.g.: @raw 2049, "", 0, 10, 0, 50, 0, 1

The command must be inserted inside a parallel process, because Game_Clock::SetGameSpeedFactor(speed); only changes the speed at current frame.

Any refactor (to improve how it's called or to hide the speed counter) is welcome.