Adding McHCK DFU Bootloader

- Heavily modified, not compatible with McHCK images
- Uses 4k of Flash (rather than 3k)
- LED turns on when in firmware flash mode
- Changed the USB IDs
- Added CMake build system
- Updated linker script to be closer to what is used for the rest of the projects
- Removed a lot of unnecessary code
- Added a license header to each file (using the same license as the McHCK had)
- Updated the USB Vendor, Product and Serial strings
- Using the Kiibohd initialization sequence rather than the McHCK one
- Using Kiibohd interrupt vector table and other misc mk20dx setup

Bootloader/flash.h

@@ -0,0 +1,38 @@
+/* Copyright (c) 2011,2012 Simon Schubert <2@0x2c.org>.
+ * Modifications by Jacob Alexander 2014 <haata@kiibohd.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __FLASH_H
+#define __FLASH_H
+
+// ----- Defines -----
+
+#define FLASH_SECTOR_SIZE 1024
+
+
+
+// ----- Functions -----
+
+__attribute__((section(".ramtext.ftfl_submit_cmd"), long_call))
+int ftfl_submit_cmd(void);
+int flash_prepare_flashing(void);
+int flash_erase_sector(uintptr_t);
+int flash_program_section(uintptr_t, size_t);
+int flash_program_sector(uintptr_t, size_t);
+void *flash_get_staging_area(uintptr_t, size_t);
+
+#endif
+