Use if instead of goto

[ProkopRandacek]

This PR inverts the if and removes goto in the generate_all function.
It should even skip calling more_than_one() when Type != EVASIONS evaluates to true, right? I'm new to this so sorry if I'm missing something obvious.

[BM123499]

@ProkopRandacek. Note that Type is a template instantiation. So Type != EVASIONS is calculated at compile time. So it will only check for more_than_one() if Type == EVASIONS (this last condition won't be checked at running time). I believe both codes are equivalent.

[Sopel97]

Yea, this goto is very weird here. Good patch

[snicolet]

@ProkopRandacek
At least a result for a small speed test would be good here (locally with parallel benches or on fishtest with non-regression bounds), please.

The reason is that we have the habit to never commit anything touching the hot path of Stockfish without at least one measurement, even if the change seems "obvious". Better safe 100% of the time than sorry 1% :-)

The only exception is if the compiled binaries are the same, which can be checked with md5 stockfish.exe for instance.