First draft of storage APIs (#122)

* First draft of storage APIs

* bumped pxt-core

* using fixed instances to seprate temp from permanent

* send console to storage

* sim support

* missing sim stubs

* adding storage blocks

* more sim support

* remove storage from default package

* fix rendering of ms

* render raw ms

* slize at better place

* duplicate bundled dir

* refactor limit

* simplify limit logic

pxtarget.json

@@ -16,6 +16,7 @@
         "libs/infrared-sensor",
         "libs/gyro-sensor",
         "libs/chassis",
+        "libs/storage",
         "libs/ev3",
         "libs/tests",
         "libs/behaviors"