overloading stream << operator of Vec2D class

Signed-off-by: Marcel Schwittlick <marzzzel@gmail.com>
added
- floorTest()
- fracTest()
- invertTest()
- limitTest()
- normalizeTest()
- normalizeToTest()s

Signed-off-by: Marcel Schwittlick <marzzzel@gmail.com>
implementing tests:
- addSelfTest
- subSelfTest
- setTest
- setComponenTest
- perpendicularTest
- toPolarTest
- reciprocalTest
- reflecTest
- rotateTest
- roundToTest

Signed-off-by: Marcel Schwittlick <marzzzel@gmail.com>
added barebones of roundToAxis() method

Signed-off-by: Marcel Schwittlick <marzzzel@gmail.com>
now using Vec2D's overloaded stream operator

Signed-off-by: Marcel Schwittlick <marzzzel@gmail.com>