Adding C5000 Energia version 6.70

Below are the changes done in this version
1. Code cleanup for Energia sketches
  - Remove unnecessary debug statements
  - Breakup example codes into modular programs
  - Add more comments for better understanding
2. Support for wave recorder demo
3. Added core library to avoid rebuilding everything while compiling the sketches to reduce compile time
4. Added option to change the Energia compiler path
5. Implemented circular buffering for player demo
6. Updated Energia C5000 code to be in sync with GitHub master
7. Added Pop-up for download compiler tools option