(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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#ifndef STRING_H

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#define STRING_H

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/*

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 * dst: destination buffer

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 * src: string to copy/concatenate

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 * size: size of the destination buffer

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 * usage: ttd_strlcpy(dst, src, lengthof(dst));

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 */

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void ttd_strlcat(char *dst, const char *src, size_t size);

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void ttd_strlcpy(char *dst, const char *src, size_t size);

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/*

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 * dst: destination buffer

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 * src: string to copy

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 * last: pointer to the last element in the dst array

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 *       if NULL no boundary check is performed

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 * returns a pointer to the terminating \0 in the destination buffer

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 * usage: strecpy(dst, src, lastof(dst));

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 */

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char* strecat(char* dst, const char* src, const char* last);

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char* strecpy(char* dst, const char* src, const char* last);

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#endif