BugFix VS2012 Compilation

I've tried to fix the max of issues I met in VS2012' compilation.
Please review my patch:
* 3 empty `.cpp` files are removed => are they important?
* Some changes are for VS2012 case ONLY => is this well coded?
* ...

EDIT: 
Tasks
--------
- [x] POCO libs recompilation to support SSL - resolve #1995
- [x] tess2 lib for VS2012
- [x] Clean up VS projects
- [x] Command Line compilation accessibility
- [x] Fix compilation projectGenerator
- [x] Update openCV library
- [x] Fix some declarations/definitions/includes