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

libs/core/shims.d.ts

@@ -41,6 +41,10 @@ declare interface MMap {
     /** Perform read(2) on the underlaying file */
     //% shim=MMapMethods::read
     read(data: Buffer): int32;
+
+    /** Set pointer on the underlaying file. */
+    //% shim=MMapMethods::lseek
+    lseek(offset: int32, whence: SeekWhence): int32;
 }
 declare namespace control {