Servo library support (#1343)

* ateempt at bringin servos

* basic plumbing

* avoid math map duplicate

* missing parts annontation

* pretify parts

* extend appcompat layer

* updated strings

* more compat layer

* annotations

* don't rely on webmidi

* updated pxt ref

* bump pxt

* adding whenUsed

* updated v1 readme

* more pins

* more pins

* compress the parts definition

* update common packages

libs/core/pxt.json

@@ -13,10 +13,11 @@
         "dal.d.ts",
         "enums.d.ts",
         "shims.d.ts",
-        "pxt-core.d.ts",
+        "pxt-core.d.ts",        
         "core.cpp",
         "pxt-helpers.ts",
         "helpers.ts",
+        "pinscompat.ts",
         "codal.cpp",
         "images.cpp",
         "basic.cpp",