Add initial version of c-picker

Introduce the following features to c-picker:

* Picking of the elements from C source files:
  * Include directives
  * Functions
  * Variables
* Removing 'static' keyword from declarations
* Mapping coverage to the original source
* Documentation of the system

Signed-off-by: Imre Kis <imre.kis@arm.com>
Change-Id: Ia5cb90d3096b16b15aafb86363b8cabfe7d2ab72
28 files changed