Version 0.3
* Overhauled the code with significant improvements in performance.
* Improved UI interaction
* Now the plugin works with existing selection, the plugin won't reset
exisitng selection thus enabling selecting features ahead of using the plugin.
* Add help notes to describe the different options in the plugin
* Added annotation near the drawn line for ordering execution reference and
convenience
* Added add, remove, filter options that can be drawn.
* Added automatic/manual mode, automatic mode: first adds to selection and
than filters for each drawn line, manual mode: enable the user to add, remove or
filter in every step
* Added tabs to distinguish between automatic/manual
* Change the colors of the strokes, Green is add to selection, Blue is
filter from selection, and black is remvoe from selection.
