Revise natives code

[Kenzzer]

What's changed ?

Instead of all the natives being inside various include files, and then all included by natives.h we instead divide those natives into multiple .hpp and .cpp files, available in the natives directory. Very much mirroring the setup of our .inc files.

New way to register natives

No more global array, instead an std::vector is passed around by reference. The natives are then added to it by each .cpp module. Furthermore, macros to define native functions have been eliminated. Everything are now locally defined functions, only available in their respective .cpp file.

Example :

void setup(std::vector<sp_nativeinfo_t>& natives) {
    area::setup(natives);
    surroundingareas::setup(natives);

    tf::nav::setup(natives);

    sp_nativeinfo_t list[] = {
        {"CNavMesh.Address.get", GetAddress},
        {"CNavMesh.IsLoaded", IsLoaded},
        {"CNavMesh.IsAnalyzed", IsAnalyzed},
        {"CNavMesh.IsOutOfDate", IsOutOfDate},
        {"CNavMesh.GetNavAreaCount", GetNavAreaCount},
        {"CNavMesh.CollectSurroundingAreas", CollectSurroundingAreas},
        {"CNavMesh.GetNavAreaByID", GetNavAreaByID},
        {"CNavMesh.GetNearestNavArea", GetNearestNavArea},
        {"CNavMesh.BuildPath", BuildPath},
        {"CNavMesh.GetNavArea", GetNavArea},
        {"CNavMesh.GetNavAreaEntity", GetNavAreaEntity},
    };

    natives.insert(natives.end(), std::begin(list), std::end(list));
}

New coding style for {}

As of this PR, I wish that we adopt Rust's styling for .cpp and .hpp files. The extension never had a coding style to begin with, so I believe this is a good point to start introducing some.

New/updated natives

• Added the following natives to the extension. The usefulness and 0 gamedata cost more than enough warrants the addition of such a useful methodmap to the extension.

  CTakeDamageInfo.CTakeDamageInfo
  GetInflictor
  SetInflictor
  GetWeapon
  SetWeapon
  GetAttacker
  SetAttacker
  GetDamage
  SetDamage
  GetMaxDamage
  SetMaxDamage
  ScaleDamage
  AddDamage
  SubtractDamage
  GetDamageBonus
  SetDamageBonus
  GetDamageBonusProvider
  GetBaseDamage
  BaseDamageIsValid
  GetDamageForce
  SetDamageForce
  ScaleDamageForce
  GetDamageForForceCalc
  SetDamageForForceCalc
  GetDamagePosition
  SetDamagePosition
  GetReportedPosition
  SetReportedPosition
  GetDamageType
  SetDamageType
  AddDamageType
  GetDamageCustom
  SetDamageCustom
  GetDamageStats
  SetDamageStats
  SetForceFriendlyFire
  IsForceFriendlyFire
  GetAmmoType
  SetAmmoType
  GetAmmoName
  GetPlayerPenetrationCount
  SetPlayerPenetrationCount
  GetDamagedOtherPlayers
  SetDamagedOtherPlayers
  SetCritType
  GetCritType

• Fixed CBaseNPC and CExtNPC natives not verifying invalid npc index. Leading to spectacular nullpointer crashes.

Prepare for TF2 x64 bits

In addition to everything above, speculative but correct changes have been made to hopefully prepare enough the extension for the eventual release of 64bits tf2. See alliedmodders/hl2sdk#127 for further details.