Add new SliderValue GUI widget

Signed-off-by: Vojtech Bocek <vbocek@gmail.com>

Change-Id: Ic5d44314f501341140dd7059d1cb753341f5844c
diff --git a/gui/Android.mk b/gui/Android.mk
index 748c5ec..35d877b 100644
--- a/gui/Android.mk
+++ b/gui/Android.mk
@@ -17,6 +17,7 @@
     animation.cpp \
     conditional.cpp \
     slider.cpp \
+    slidervalue.cpp \
     listbox.cpp \
     keyboard.cpp \
     input.cpp \
@@ -52,6 +53,11 @@
 ifneq ($(TW_BRIGHTNESS_PATH),)
 	LOCAL_CFLAGS += -DTW_BRIGHTNESS_PATH=$(TW_BRIGHTNESS_PATH)
 endif
+ifneq ($(TW_MAX_BRIGHTNESS),)
+	LOCAL_CFLAGS += -DTW_MAX_BRIGHTNESS=$(TW_MAX_BRIGHTNESS)
+else
+	LOCAL_CFLAGS += -DTW_MAX_BRIGHTNESS=255
+endif
 ifneq ($(TW_NO_SCREEN_BLANK),)
 	LOCAL_CFLAGS += -DTW_NO_SCREEN_BLANK
 endif