Nvm fota (#1018)

* New Firmware OTA for NVM/mcuboot (nRF5)

- Support for mcuboot (nRF5)
- Support for run length encoded data
- Support for smaller FIRMWARE_BLOCK_SIZE, if required

* Update NVM

* New MY_LOCK_MCU for NRF5

* Test with Sensebender GW + Sensebender Micro was successful

MyConfig.h

@@ -1654,6 +1654,23 @@
 #define MY_SIGNING_SOFT_RANDOMSEED_PIN (7)
 #endif
 
+/**
+ * @def MY_LOCK_DEVICE
+ * @brief Enable read back protection
+ *
+ * Enable read back protection feature. Currently only supported by NRF51+NRF52.
+ * Use this flag to protect signing and encryption keys stored in the MCU.
+ *
+ * Set this flag, when you use softsigning in MySensors. Don't set this
+ * in SecurityPersonalizer.
+ *
+ * @warning YOU CAN BRICK YOUR DEVICE!!!
+ *          Don't set this flag without having an boot loader, OTA firmware update and
+ *          an Gateway connection. To reset an device, you can try >>
+ *          openocd -f interface/cmsis-dap.cfg -f target/nrf52.cfg -c "program dap apreg 1 0x04 0x01"
+ */
+//#define MY_LOCK_DEVICE
+
 /**
  * @def MY_SIGNING_FEATURE
  * @ingroup internals
@@ -2023,6 +2040,7 @@
 #define MY_INDICATION_HANDLER
 #define MY_DISABLE_REMOTE_RESET
 #define MY_DISABLE_RAM_ROUTING_TABLE_FEATURE
+#define MY_LOCK_DEVICE
 // core
 #define MY_CORE_ONLY
 // GW