(svn r1741) - Fix: added IsVehicleIndex() so it's possible to protect GetVehicle() from reading an invalid vehicle index
- Fix: added check for v->type in some commands, which expects v to be a specific type

Checks like this is needed to protect network servers from people, who hack their clients to either cheat or crash the server

NOTE: if I made a mistake here it can make a function unreachable when it should be used. Here is one place to look if something weird happens

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#ifndef CALLBACK_TABLE_H

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#define CALLBACK_TABLE_H

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extern CommandCallback *_callback_table[];

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extern const int _callback_table_count;

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#endif