Integrate screen APIs from common packages (#343)

* starting screen api intergration

* Further image integration

* Aligning with new screen apis

* Build fixes

* Adjust to common screen state

* Fix unpackPNG

* Add game library

* Optimize screen rendering

* bumping common packages

* updated shims

* moving images into ev3

* upgrading to common packages

* added try/use

* cap

* fixed tryp age

libs/core/pxt.json

@@ -16,7 +16,6 @@
         "buttons.ts",
         "png.cpp",
         "screen.cpp",
-        "screen.ts",
         "battery.ts",
         "output.cpp",
         "output.ts",
@@ -26,8 +25,6 @@
         "shims.d.ts",
         "enums.d.ts",
         "dal.d.ts",
-        "images.ts",
-        "images.jres",
         "icons.jres",
         "ns.ts"
     ],