implement new light mode (off/day/night/simulation)

missing:
- fully connect it to the ui
- setup duration in light settings

Signed-off-by: Peter Siegmund <developer@mars3142.org>

firmware/main/i2c_checker.h

@@ -8,11 +8,6 @@
 #define I2C_MASTER_SDA_PIN ((gpio_num_t)CONFIG_DISPLAY_SDA_PIN)
 #define I2C_MASTER_SCL_PIN ((gpio_num_t)CONFIG_DISPLAY_SCL_PIN)
 
-#ifdef __cplusplus
-extern "C"
-{
-#endif
-    esp_err_t i2c_bus_scan_and_check(void);
-#ifdef __cplusplus
-}
-#endif
+__BEGIN_DECLS
+esp_err_t i2c_bus_scan_and_check(void);
+__END_DECLS