(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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#include <stdio.h>

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// This pretty simple file checks if the system is LITTLE_ENDIAN or BIG_ENDIAN

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//  it does that by putting a 1 and a 0 in an array, and read it out as one

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//  number. If it is 1, it is LITTLE_ENDIAN, if it is 256, it is BIG_ENDIAN

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//

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// After that it outputs the contents of an include files (endian.h)

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//  that says or TTD_LITTLE_ENDIAN, or TTD_BIG_ENDIAN. Makefile takes

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//  care of the real writing to the file.

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int main (int argc, char *argv[]) {

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  unsigned char EndianTest[2] = { 1, 0 };

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  int force_BE = 0, force_LE = 0;

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  if (argc > 1 && strcmp(argv[1], "BE") == 0)

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    force_BE = 1;

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  if (argc > 1 && strcmp(argv[1], "LE") == 0)

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    force_LE = 1;

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  printf("#ifndef ENDIAN_H\n#define ENDIAN_H\n");

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  if ( (*(short *) EndianTest == 1 && force_BE != 1) || force_LE == 1)

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    printf("#define TTD_LITTLE_ENDIAN\n");

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  else

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    printf("#define TTD_BIG_ENDIAN\n");

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  printf("#endif\n");

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  return 0;

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}