WIP: Native GPIO

- dummy and Linux sysfs GPIO drivers for native
- minor PIR driver test fix

TODO:
- [ ] add signal mode for sysfs driver
- [ ] test sysfs driver on raspberry PI
- [ ] add control method for dummy interface
- [ ] address sysfs GPIO availability issue
`-DNATIVE_GPIO_NUMOF=42`
```c
#ifdef NATIVE_GPIO_NUMOF
#   if NATIVE_GPIO_NUMOF > 16
#       define GPIO_NUMOF 16
#   else
#       define GPIO_NUMOF NATIVE_GPIO_NUMOF
#   endif
#else
#    define GPIO_NUMOF 0
#endif

#if GPIO_NUMOF > 0
#   define GPIO_0_EN 1
#endif
#if GPIO_NUMOF > 1
#   define GPIO_1_EN 1
#endif
…
#if GPIO_NUMOF > 15
#   define GPIO_15_EN 1
#endif
```
?