Open.mp compatibility

[d-3fault]

This PR fixes all the warnings / errors regardless of using open.mp or samp and old or new compiler

[d-3fault]

Please check it out now and tell me if i should change something

[NexiusTailer]

Ok, checking the code now I can notice only a few things:

1. Looks like you missed acc_AddPlayerClassEx from adding tags if being on omp-stdlib, basically same additions like in acc_AddPlayerClass should be copied there
2. SPECIAL_ACTION_CARRY still occured in this one place, which should be changed to 25 like it's in all other places
3. AC_CONST should be moved a bit higher, before #if !defined FILTERSCRIPT check at the top of the .inc file. The reason is that this macro is used for ALS native hooks (those ones with acc_ prefixes) which can be called from a filterscript too, since anticheat redirects all necessary natives to be called from gamemode
4. This code can be omitted now since we anyway pass needed tag here, to the rest of the hook chain

Please also make sure you have covered all native hooks (maybe there's anything more left other than AddPlayerClassEx). If it's the only one missed function, I don't have anything major to notice besides it.

[d-3fault]

i used the script that contains most of the functions you provided in discord (after converting it to open.mp) , it may be missing some functions but the only warning that was shown is the one you mentioned in acc_AddPlayerClassEx.