1) Applied Stehen's patch to give each kart separate sound effects objects,

and add engine sounds.
2) Added sfx manager so that the buffers for the sfx are shared between
   all sfx objects.
3) Moved all audio related files into audio subdirectory.


git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/trunk/supertuxkart@2275 178a84e3-b1eb-0310-8ba1-8eac791a3b58

data/stk_config.data

@@ -59,7 +59,7 @@
    ;; allows for tighter turns at lower speeds
    (min-speed-angle           0 19)
    (max-speed-angle          12  6.4)
-   (engine-power            400    )
+	(engine-power            400    )
    (mass                    225    )
    (suspension-stiffness     48.0  )
    (wheel-damping-relaxation  2.3  )
@@ -76,7 +76,7 @@
    (front-wheel-connection   0.38 0.6 0)
    (rear-wheel-connection    0.38 -0.6 0)
    (suspension-rest           0.2  )
-   (suspension-travel-cm    500    )
+	(suspension-travel-cm    500    )
 
    ;; The z-axis velocity set when a jump is initiated. This will cause the
    ;; kart to start rising, till it is pulled back by gravity. A higher value
@@ -89,8 +89,9 @@
    ;;                        0.5  means: if speed <=0.5 *maxSpeed --> gear 2
    ;; The next vector contains the increase in max power (to simulate different
    ;; gears), e.g. 2.5 as first entry means: 2.5*maxPower in gear 1
-   (gear-switch-ratio         0.25  0.5  0.75)
-   (gear-power-increase       2.5   1.8  1.4 )
+	;;                     | first  | second |  third |
+   (gear-switch-ratio          0.25      0.7      1.0)
+   (gear-power-increase    2.2      1.7      1.3)
    (upright-tolerance         0.2)
    (upright-max-force         30)
    (camera-max-accel          10)