(svn r2868) Change the way NewGRFs are loaded: The loading process i no longer bolted onto the normal graphics loading.
This has two major advantages:
- Removal of a maze of global variables and distinction of cases from the sprite loading routines, which weren't directly related to the loading process in the first place
- NewGRF actions no longer occupy sprite slots - for example when using DBSetXL this saves about 2000 slots! (you could regard this as a bug fix)
If i didn't make a major mistake this change should have no negative effect on NewGRF support, please test!

(svn r2867) \[Translations\] Updating translations

(svn r2866) Move all functions and tables which aren't directly involved in managing the sprite heap to a new file gfxinit.c.
This doesn't ease the global variable mess, but makes the distinction between sprite heap and gfx loading routines easier.

(svn r2865) Push the responsibility for allocating the sprite heap into GfxInitSpriteMem()

(svn r2864) Code simplification and diff reduction

(svn r2863) Move some type declarations into saveload.c, should've been part of r2819

(svn r2862) Return a proper version number, when testing the TTDPatch version in the SkipIf action. Pretend to be version 2.0.1 alpha 49 for now.
Also change the type of the variables, which get compared, to uint32, because the values are at most 32bits wide and always seem to be unsigned.

(svn r2861) Move inclusion of setjmp.h into saveload.c, should've been part of r2819

(svn r2860) Fix some issues in the savegame/scenario list code:
-Fix: Sort the directories when making a scenario list
-Fix: Sort the directories when making a savegame list on Windows
-Fix: On OS/2 show the trailing \ if the current directory is a root directory
-Regression: On OS/2 the savegame list showed the scenario directory or crashed (probably introduced in r2609)
The rest is diff reduction between the 3 variants

(svn r2859) \[Translations\] Updating translations