(svn r2868) Change the way NewGRFs are loaded: The loading process i no longer bolted onto the normal graphics loading.
This has two major advantages:
- Removal of a maze of global variables and distinction of cases from the sprite loading routines, which weren't directly related to the loading process in the first place
- NewGRF actions no longer occupy sprite slots - for example when using DBSetXL this saves about 2000 slots! (you could regard this as a bug fix)
If i didn't make a major mistake this change should have no negative effect on NewGRF support, please test!

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/* $Id$ */

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#ifndef DRIVER_H

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#define DRIVER_H

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void LoadDriver(int driver, const char *name);

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bool GetDriverParamBool(const char* const* parm, const char* name);

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int GetDriverParamInt(const char* const* parm, const char* name, int def);

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void GetDriverList(char* p);

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#endif