Tidy up IRLock library

[peterbarker]

• adds a config.h
• eliminates the dual-level include files
• uses proper defines around header and implementation files.

Board                    AP_Periph  blimp  bootloader  copter  heli  iofirmware  plane  rover  sub
CubeOrange-periph-heavy  *                 *
CubeRedPrimary                      *      *           0       0                 0      0      *
Durandal                            *      *           0       0                 0      0      *
Hitec-Airspeed           *                 *
KakuteH7-bdshot                     *      *           0       0                 0      0      *
MatekF405                           *      *           *       *                 *      *      *
Pixhawk1-1M-bdshot                  *                  0       0                 0      0      *
f103-QiotekPeriph        *                 *
f303-Universal           *                 *
iomcu                                                                *
revo-mini                           *      *           *       *                 *      *      *
skyviper-journey                                       0
skyviper-v2450                                         *

[rmackay9]

Great that you're fixing this up. This is an incredibly old library