I2C device manager (#2282)

* message on dev list change

* dc detect

* added sht3x sensor.

* separete environment data from light

* max17055 moved to i2c dev

* sht fix, goterror detection fix

* fix ext sensor app display for a lot of devices.

* added bh1750 driver

* autoscan on main view

* added devlist mutex

* better timing

* fix h2 sw8 on poweron by usb

firmware/common/i2c_pp.hpp

@@ -59,7 +59,7 @@ class I2C {
 
     void start(const I2CConfig& config);
     void stop();
-
+    bool probe(i2caddr_t addr, systime_t timeout = TIME_INFINITE);
     bool receive(
         const address_t slave_address,
         uint8_t* const data,