(svn r7565) -Codechange: Rework DEBUG functionality. Look for appropiate debugging levels to
use in debug.h. grfmsg() is now used as a specific debug-function for grf.

(svn r7283) -Revert (r1932): Remove scancode 41 for linux console because it is 49. If some linux
flavour does use 41, use proper #ifdef guards around it, because right now 'f' also
toggles console.

(svn r7170) -Fix: [sdl] Non-working console toggle for some keyboard layouts. Do not OR the backquote
character but set it. Happened on Linux with Hungarian keyboard for example.

(svn r7157) -Fix [FS#221, SF1168820]: Some mouse events possibly lost under high CPU load, handle
mouse input right away instead of waiting for GameLoop. (KUDr)

(svn r7156) -Codechange: Remove obsolete variable, localize global variable, use GB and change logic
of the win32: TAB speeds up, but ALT+TAB doesn't code.

(svn r7153) -Fix [FS#279]: Some keyboard events possibly lost under high CPU load, handle
keyboard input in place instead of global variables magic. (KUDr)

(svn r7048) -Cleanup: DEBUG doesn't need a newline character, use DEBUG instead of printf and the
verb is build/built/built not build/*/build or build/*/builded.

(svn r6380) -Codechange: unify all ways to quit OTTD.
This means that in the intro menu the 'Quit' button immediatelly quits
and the 'Quit' in the menu of the normal game and scenario editor
immediatelly quits when the 'autosave_on_exit' patch is turned on.
This is the same way as the OS/window manager initiated quits, like
alt-F4 and the 'x' in the (OS/window manager drawn) title bar of OTTD.

(svn r5946) -Add: merged the TGP branch to mainline. TGP adds:
- New optional landscape generator (TerraGenesis Perlin)
- Load heightmaps (either BMP or PNG)
- Progress dialog while generating worlds (no longer a 'hanging' screen)
- New dialogs for NewGame, Create Scenario and Play Heightmap
- Easier to configure your landscape
- More things to configure (tree-placer, ..)
- Speedup of world generation
- New console command 'restart': restart the map EXACTLY as it was when you
first started it (needs a game made after or with this commit)
- New console command 'getseed': get the seed of your map and share it with
others (of course only works with generated maps)
- Many new, world generation related, things
- Many internal cleanups and rewrites
Many tnx to those people who helped making this:
Belugas, DaleStan, glx, KUDr, RichK67, Rubidium, and TrueLight (alfabetic)
Many tnx to those who helped testing:
Arnau, Bjarni, and tokai (alfabetic)
And to all other people who helped testing and sending comments / bugs
Stats: 673 lines changed, 3534 new lines, 79 new strings

(svn r2728) -Fix/Feature: Change the driver probing algorithm
Instead of trying to start a single driver and bailing out if that fails, try to initialise one by one and use the first one which succeeds.
This should fix problems on machines with no sound card, where -s null had to be specified manually.