Improve FastRNG implementation

[DelinWorks]

Describe your changes

improved FastRNG struct to have better performance, clearer inclusive and exclusiveness, and more uniform distribution of random numbers generated.
also improved particle system and cpp-tests

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For each PR

• Add Copyright if it missed:
  - "Copyright (c) 2019-present Axmol Engine contributors (see AUTHORS.md)."

• I have performed a self-review of my code.

  Optional:

  • I have checked readme and add important infos to this PR.
  • I have added/adapted some tests too.

For core/new feature PR

• I have checked readme and add important infos to this PR.
• I have added thorough tests.

[halx99]

int main()
{
#if defined(_DEBUG)
    std::print(std::cout, "test on debug build\n");
#else
    std::print(std::cout, "test on release build\n");
#endif
    constexpr int test_rounds = 10;
    constexpr int test_count = 10000000;
    FastRNG rgn;
    std::minstd_rand stdrgn;

    double total1 = 0;
    double total2 = 0;

    rgn.seed(time(NULL));
    stdrgn.seed(time(NULL));

    for (int k = 0; k < test_rounds; ++k) {

        auto start = axmol::highp_clock();
        for (int i = 0; i < test_count; ++i) {
            total1 += rgn.rangef(0, 1);
        }
        auto diff = axmol::highp_clock() - start;

        std::print(std::cout, "FastRGN cost: {} ms\n", diff / 1000.0);

        start = axmol::highp_clock();
        for (int i = 0; i < test_count; ++i) {
            total2 += stdrgn() / (double)stdrgn.max();
        }
        diff = axmol::highp_clock() - start;

        std::print(std::cout, "minstd_rand cost: {} ms\n", diff / 1000.0);
    }

    std::print(std::cout, "total1={}, total2={}", total1, total2);
    return 0;
}

release build, fast rng is faster than std::minstd_rand, good job, merged

[halx99]

BTW: do we need move class FastRNG into namespace ax?

[DelinWorks]

thank @smilediver he's the one that wrote and suggested these awesome optimizations

[DelinWorks]

BTW: do we need move class FastRNG into namespace ax?

come to think of it yeah it should be in the ax namespace

[DelinWorks]

also some functions need to be static too, I'll do PR

[smilediver]

I've also noticed that this never was in ax namespace. Maybe it should be added?

[halx99]

miss include math/MathBase.h