New version of Java wrappers' generator uses different wrappers for VideoCapture
on Android and desktop to prevent binary compatibility issues.

- enable auto-wrap of VideoCapture;
- minor refactoring of generated code templates.

Common part of all source files is extracted to special header

More granular build of Java API: it is now possible to build Java wrappers only for the subset of OpenCV modules

* fixed manually ported classes;
* added vector<vector<Point>> support;
* changed argument types for 3 functions;
* finished tests for org.opencv.core.Core class.