make LowLoad / HighLoad lcdproc.conf parameters instead compile time options

clients/lcdproc/lcdproc.conf

@@ -68,6 +68,10 @@ Active=True
 [Load]
 # Show screen
 Active=True
+# Min Load Avg at which the backlight will be turned off [default: 0.05]
+LowLoad=0.05
+# Max Load Avg at which the backlight will start blinking [default: 1.3]
+HighLoad=1.3
 
 
 [TimeDate]