Update README: link packages

- Clean up a lot of code (a lot as per VS code analysis recommendations and required
- Added a lot more test cases and functional test (found and fixed a couple of bugs when using more complex data).
- Enhanced the sample app.

Closes #18

- added bool ShouldSerialize_xxx_Value() that checks Has_xxx_Value property
- added unit tests

closes #22

* Last point removed for polygon rings
* Multipoint encode fix

TileRange Count property was an `int` which fails when zoom level is >= 16. Changed it to a `long` and added a test case for this scenario.

* Last point removed for polygons in MapboxTileWriter

* Multipoint encode fix

* MultiPoint in MapBoxTileWriter: returned and modified the point hit check in extent

* Pixel coordinates are made integer

* Added comments and a little refactoring

* Reverted some tests. The IsGreaterThanOnePixelOfTile method has been moved to TileGeometryTransform

* Removed unused using

* Returned the old conversion methods to the WebMercatorHandler class