enhance samples

Main ideas for PR:
- it is convenient to have the same file names for samples with the same functionality (that is why SimpleSample.java was reworked to existing opencv_version sample)
- also good to have all samples for all languages (that is why opencv_version sample was implemented for java and python in the same way as it was in cpp and java file was moved to root java folder)
- slightly changed build/run procedure for ant java on more convenient with two scripts: executeBuild - to build sample and run - to run already built sample.