Support latest PXT with GC (#1798)

* Enable gc and basic compilation fixes

* Add missing GC stuff

* Set microbit-dal version

* Disable jacdac in servo

* UTF fixes

* TS build fixes

* Auto-generated files update

* We only seem to have that much

* Fix for new new compiler

* Account for uninitialized scheduler

* Intialize memory allocator

* bump references

* updated package

* Set image tag, requires https://github.com/Microsoft/pxt/pull/5262

* updated project summaries

* Fixing block tests

libs/servo/_locales/servo-jsdoc-strings.json

@@ -1,5 +1,5 @@
 {
   "servos.Servo.run": "Set the throttle on a continuous servo",
   "servos.Servo.run|param|speed": "the throttle of the motor from -100% to 100%",
-  "servos.Servo.setAngle": "set the servo angle"
+  "servos.Servo.setAngle": "Set the servo angle"
 }

libs/servo/_locales/servo-strings.json

@@ -5,6 +5,7 @@
   "servos.Servo.run|block": "continuous %servo run at %speed=speedPicker \\%",
   "servos.Servo.setAngle|block": "set %servo angle to %degrees=protractorPicker °",
   "servos.Servo.setPulse|block": "set %servo pulse to %micros μs",
+  "servos.Servo.stop|block": "stop %servo",
   "{id:category}Servos": "Servos",
   "{id:group}Servos": "Servos"
 }