HackFix: Mimic forwardsys style of pawn calling.
Store only the callback as per VoiDeD, re-eval if HookList changes.
Pre-allocate 8 elements to skip trivial reallocations near the beginning of the vectors life.
Rename SDKHooks function and variable to be friendlier.
Merge pull request #107 from alliedmodders/sdkhackfix

Copy SDKHooks vector instead of taking a reference.