Removed trailing spaces in the most relevant files

Command used for the job:
egrep -rl ' $' --include *.c --include *.h --include  *.s --include  *.inc --include  *.txt *  | xargs sed -i 's/\s\+$//g'

Credits to Grant Murphy from Stack Overflow.

src/image_processing_effects.c

@@ -733,11 +733,11 @@ static u16 QuantizePixel_BlurHard(u16 *prevPixel, u16 *curPixel, u16 *nextPixel)
     red   = GET_R(*curPixel);
     green = GET_G(*curPixel);
     blue  = GET_B(*curPixel);
-    
+
     prevAvg = (GET_R(*prevPixel) + GET_G(*prevPixel) + GET_B(*prevPixel)) / 3;
     curAvg  = (GET_R(*curPixel)  + GET_G(*curPixel)  + GET_B(*curPixel))  / 3;
     nextAvg = (GET_R(*nextPixel) + GET_G(*nextPixel) + GET_B(*nextPixel)) / 3;
-    
+
     if (prevAvg == curAvg && nextAvg == curAvg)
         return *curPixel;
 
@@ -1096,7 +1096,7 @@ static u16 QuantizePixel_PrimaryColors(u16* color)
     u16 red =   GET_R(*color);
     u16 green = GET_G(*color);
     u16 blue =  GET_B(*color);
-    
+
     if (red < 12 && green < 11 && blue < 11)
         return 1;