(svn r1407) -Codechange: changed a lot around _stations, _vehicles, _towns and _industries
(in prepare of dynamic arrays):
- DEREF_XXX is changed into GetXXX
- All direct call are directed via GetXXX
- struct Industry has now an index-field
- ENUM'd some stuff
- Replaced home built loops with FOR_ALL_XXX
- Added _stations_size, _vehicles_size, ... which gives the length of the
array (which will be dynamic in the near future)
- Changed lengtof(XXX) to _XXX_size (e.g. _stations_size)
- Removed all endof(XXX) (because mostly it was part of a FOR_ALL_XXX)
- Made the sort-functions of all 4 dynamic
- Made all 4 Initialize functions more of the same
- Some minor tab-fixing and stuff
(tnx to Tron for proof-reading my 100kb patch ;))

Note for all: please do NOT directly call _stations, _vehicles, _towns and
_industries, but use the right wrapper to access them. Thank you.
Ps: please also do not use 'v++', where v is of type Vehicle *.

#include "stdafx.h"
#include "ttd.h"
#include "map.h"

uint _map_log_x = TILE_X_BITS;
uint _map_log_y = TILE_Y_BITS;

#define MAP_SIZE ((1 << TILE_X_BITS) * (1 << TILE_Y_BITS))

byte   _map_type_and_height [MAP_SIZE];
byte   _map5                [MAP_SIZE];
byte   _map3_lo             [MAP_SIZE];
byte   _map3_hi             [MAP_SIZE];
byte   _map_owner           [MAP_SIZE];
uint16 _map2                [MAP_SIZE];
byte   _map_extra_bits      [MAP_SIZE / 4];

const TileIndexDiffC _tileoffs_by_dir[] = {
	{-1,  0},
	{ 0,  1},
	{ 1,  0},
	{ 0, -1}
};