LSM6DS3TR-C support (#3593)

* started work on pulling in the unphone library and dependencies, to do e.g. power switch management and etc.; currently failing at Adafruit_ImageReader

* now compiles with unphoneLibrary included

* successfully pulled in unphone library to manage power switch and init vibe motor and etc.
doesnt print to serial tho...

* simplified the build a bit; when doing meshtastic do not depend on the MCCI lora libs etc., then also no need to config them via build flags

* version that doesnt trigger brownout

* cleaned up initVariant a little

* note re. GPS

* back to mesh upstream version

* this time we're back to mesh upstream version

* getting LSM6DS3TRC driver installed

* shake to wake works, set threshold quite low may need increasing

* whats the crack with these end of file changes?

* paramatize the wake threshold

* try to get the PR to just include real changes

* got the right config item and also not giving compiler messages

* moved the lib_deps for the LSM6DS3TRC driver from our variant platformio.ini to the main one in root so all boards have it

* stuupid error #define-ing

---------

Co-authored-by: Hamish Cunningham <hamish@gate.ac.uk>
Co-authored-by: Ben Meadors <benmmeadors@gmail.com>

src/configuration.h

@@ -128,6 +128,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #define MPU6050_ADDR 0x68
 #define LIS3DH_ADR 0x18
 #define BMA423_ADDR 0x19
+#define LSM6DS3_ADDR 0x6A
 
 // -----------------------------------------------------------------------------
 // LED
@@ -280,4 +281,4 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #ifdef MESHTASTIC_EXCLUDE_SCREEN
 #undef HAS_SCREEN
 #define HAS_SCREEN 0
-#endif
+#endif