Diffed and merged, preserving my updates

- changed the variables from keypad to reprapworld_keypad
- added a missing ifdef check

Argument order of lcd_buzz was set to mirror that on tone(). Change
default M300 frequency to something audible.

A new variable was introduced to allow fan animation on the GLCD.
Add additional float to string conversion routine without sign
character. This is used for the coordinates visualisation on the GLCD.

This includes refactoring the buttons code to remove a large amount of
non-pin dependent duplication from pins.h.

The cli(); at the start of the kill() function also stops the internal
arduino timer which stops updating of millis() which prevents the
display of the "KILLED." message.
The new function updates the display directly without checking any
timers.

This is required when moving the buttons_init() function to the
lcd_init() function

Since the class "MainMenu" was used within a static variable the
initialization of the object (constructor call) was done before Arduino
library startup. It always caused a crash when using AVRStudio with
JTAG debugger (caused from calling the LCD initialization / the lot of
I/O work / the stack used during this calls). By moving the LCD_INIT
out of the constructor and using an explicit call inside of Arduino
setup() implementation immediately fixed all problems and the JTAG
debugger runs fine.

that pulls down the SDCARDDETECT pin and mimicking the pull and reinsert ofa a SD card

- redo disable Beeper if PIN is set to -1

Found a couple of unused variables, that I commented.
Tried to solve the program memory warning message, and failed.

Merge branch 'Marlin_v1' of https://github.com/ErikZalm/Marlin into Marlin_v1

Conflicts:
	Marlin/Marlin.pde
	Marlin/ultralcd.h