Add GetDispatch hook

[tmp64]

This PR adds a hook for GetDispatch function. It is used by WeaponMod.

It additionally bumps the API version to 3.14159265. #951 also bumped the version in rehlds/version/version.h but I didn't. Let me know and I'll fix the commit.

[StevenKal]

Despite having "GetDispatch" hook could be better (since this is the "inside" function), was not the already existing hook "GetEntityInit" not enough for WeaponMod?

[tmp64]

You're right. I could just hook GetEntityInit since it simply calls GetDispatch. I'll check and report back later

ENTITYINIT GetEntityInit_internal(char *pClassName)
{
    return (ENTITYINIT)GetDispatch(pClassName);
}

ENTITYINIT EXT_FUNC GetEntityInit_api(char *pClassName)
{
    return g_RehldsHookchains.m_GetEntityInit.callChain(GetEntityInit_internal, pClassName);
}

ENTITYINIT GetEntityInit(char *pClassName)
{
    return GetEntityInit_api(pClassName);
}

[tmp64]

Yep, GetEntityInit hook works just fine. GetDispatch seems to be used as a generic dlsym in the engine. I guess this PR could be left as is in case someone wants to hook GameDLL functions without a hooking library.