QMK DFU bootloader generation (#2009)

* adds :bootloader target

* update planck and preonic revisions

* remove references to .h files for planck

* update preonic keymap

* only add keyboard.h files that exist

* add production target

* hook things up with the new lufa variables

* update rules for planck/preonic

* back backlight key turn of status led when pressed

* add manufacturer/product strings to bootloader

lib/lufa/LUFA/Drivers/Board/AVR8/QMK/LEDs.h

@@ -103,10 +103,20 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
         #define A6 0x06
         #define A7 0x07
 
-        #define QMK_ESC_COL F1
-        #define QMK_ESC_ROW D5
-        #define QMK_LED     E6
-        #define QMK_SPEAKER C6
+        #include "Keyboard.h"
+
+        #ifndef QMK_ESC_INPUT
+            #define QMK_ESC_INPUT F1
+        #endif
+        #ifndef QMK_ESC_OUTPUT
+            #define QMK_ESC_OUTPUT D5
+        #endif
+        #ifndef QMK_LED
+            #define QMK_LED     E6
+        #endif
+        #ifndef QMK_SPEAKER
+            #define QMK_SPEAKER C6
+        #endif
 
         #define DDR(pin) _SFR_IO8(((pin) >> 4) + 1)
         #define PORT(pin) _SFR_IO8(((pin) >> 4) + 2)