* Prototype for micro TVM.

* Cleanup and sync micro tvm prototype.

* Use /std:c++14 with MSVC.

 * Per tqchen: project has already moved to C++14
 * Presubmit failed for code that built locally on gcc.

* fix ASF lint, and fix add_asf_header too

* Compiles with USE_MICRO=OFF.

* Cleanup TargetPtr and word size representations.

* fix compile warning

* address logan's comments

* address logan and liangfu comments

* address thierry's comments

* address u99127, liangfu, tmoreau89 comments

Co-authored-by: Logan Weber <weberlo@cs.washington.edu>