GpuScratchBuffer / -Pool naively integrated with PriemOrderCalculatorAccelerator (formerly Pow2MontgomeryAccelerator). FactorEntry replaced with 2 arrays - unused field removed. Small cleanup.

PerfectNumbers.Core/PerfectNumberConstants.cs

@@ -7,6 +7,8 @@ public static class PerfectNumberConstants
     public const ulong BiggestKnownEvenPerfectP = 136279841UL;
 	public const int ConsoleInterval = 100_000;
 	public const int DefaultFactorsBuffer = 32;
+	public const int DefaultSmallPrimeFactorSlotCount = 64;
+	public const int DefaultSpecialMaxFactorCapacity = 1024;
     public const ulong ExtraDivisorCycleSearchLimit = 64UL;
     public const int MaxQForDivisorCycles = 4_000_000;
     public static readonly uint PrimesLimit = 1_000_000; //(ulong)Array.MaxLength;// 1_000_000;