(svn r2448) General cleanup of rail related code, more to follow.
* Add: rail.[ch] for rail-related enums and wrapper functions.
* Codechange: Removed dozens of magic numbers with below enums.
* Codechange: Rewrote CheckTrackCombination().
* Add: TILE_SIZE, TILE_PIXELS and TILE_HEIGHT constants.
* Add: enums RailTileType, RailTileSubtype, SignalType to mask against the map arrays.
* Add: enums Track, TrackBits, Trackdir, TrackdirBits for railway track data. (Note that the old RAIL_BIT constants are replaced by TRACK_BIT ones).
* Add: enums Direction and DiagDirection
* Codechange: Moved a bunch of track(dir) related lookup arrays from npf.[ch] to rail.[ch].
* Codechange: move RailType enum from tile.h to rail.h.
* Add: Wrapper functions for masking signal status in the map arrays: SignalAlongTrackdir, SignalAgainstTrackdir and SignalOnTrack.
* Add: Wrapper functions to access rail tiles, using above enums
* Add: Wrapper functions to modify tracks, trackdirs, directions, etc.
* Add: Wrapper functions for all lookup arrays in rail.[ch] (Arrays are still used in parts of the code)
* Codechange: Renamed some variables and arguments to better represent what they contain (railbit -> track, bits -> trackdirbits, etc.).
* Codechange: Don't use FindLandscapeHeight() in CmdRemoveSingleRail(), since it returns way too much info. Use GetTileSlope() instead.
* Codechange: [NPF] Removed some unused globals and code from npf.c.

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// stdafx.h : include file for standard system include files,

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//  or project specific include files that are used frequently, but

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//      are changed infrequently

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//

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#if !defined(AFX_STDAFX_H__532D0883_575C_4F5F_AE7E_10FB6FEC34F3__INCLUDED_)

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#define AFX_STDAFX_H__532D0883_575C_4F5F_AE7E_10FB6FEC34F3__INCLUDED_

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#if _MSC_VER > 1000

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#pragma once

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#endif // _MSC_VER > 1000

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#define WIN32_LEAN_AND_MEAN		// Exclude rarely-used stuff from Windows headers

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#include <stdio.h>

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// TODO: reference additional headers your program requires here

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//{{AFX_INSERT_LOCATION}}

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// Microsoft Visual C++ will insert additional declarations immediately before the previous line.

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#endif // !defined(AFX_STDAFX_H__532D0883_575C_4F5F_AE7E_10FB6FEC34F3__INCLUDED_)