ID manager refactoring

[Nekotekina]

New functionality added ("fixed ID"). Allows to avoid some global variables.
Some functions also added which should have been in my previous PR.

[tambry]

@Nekotekina Could you look into implementing support for structs in callbacks? Since cellSail callbacks are required to pass a struct that contains the info about why the callback was called, etc. Passing a pointer or reference doesn't work.

[Nekotekina]

C++ doesn't support reflection so you can't do much about such structs passed by value. Fortunately, it's rare. The only option is to decompose them manually according to their fields' displacement in GPRs, FPRs, VPRs registers and the stack. Here is a partial solution to cover CellSailEvent specific case:

union CellSailEvent
{
    be_t<u64> value;

    struct _data_t
    {
        be_t<u32> major;
        be_t<u32> minor;
    };
};

template<typename T, bool is_enum> struct cast_ppu_gpr;

template<> struct cast_ppu_gpr<CellSailEvent, false>
{
    force_inline static u64 to_gpr(const CellSailEvent& event)
    {
        return event.value;
    }
};

[danilaml]

@Nekotekina are you still having trouble with irc? Have you tried something like https://kiwiirc.com/? It should work.

[tambry]

@Nekotekina Thank you very much, it works great.

[tambry]

@Nekotekina Not sure about other commands, but it would seem that socket() in libnet is broken on your branch compared to latest master. Couple games that use it are: Terraria and Puzzle Quest. My guess is, that Nekotekina@b1c5ff5 somehow broke it, but I'm not sure.

[Nekotekina]

I didn't finish TLS allocator for sys_net and some other things yet.