(svn r3561) Don't use FindLandscapeHeightByTile() when it's overkill. Also use a sprite enum instead of a magic number.

(svn r3560) Restore plural forms of cargo types for several languages.
I extracted the info from 2614:2615.
If you speak one of the languages, please check if the changes are correct.

(svn r3559) - CodeChange: simplify MKCOLOR(x) macro for smallmap_gui.c by adding a TO_LE32X() macro next to TO_BE32X(). The 'X' signifies them as macros and not-inline functions so they can be used in variable declarations.

(svn r3558) Add newgrf_callbacks.h to VS project files

(svn r3557) - NewGRF: move callback enums to a new file as more than just engines will use them

(svn r3556) Add accessors for handling tree tiles
See tree.h for details

(svn r3555) -Codechange: [Big Endian] removed defining OTTD_ALIGNMENT by default on Big Endian CPUs
this increased speed when reading unaligned data (like strings)
test showed this to increase speed by 5,6% when drawing the mini map on PPC OSX

the tradeoff is that now it will crash if a Big Endian computer don't support unaligned reading
but it should easily fixable in stdafx.h if it turns out to be a problem

(svn r3554) Add accessors for the field type and fences of clear tiles

(svn r3553) - Revert r3549 "Change the behaviour of OTTD_ALIGNMENT". Some tests showed that forcing aligned reads slowed down the code (drawing smallmap) by 14%. Change back to the old behaviour.

(svn r3552) Remove the global variable _mixer