updated to v0.2.3

Voltris version 0.2.3 update!

added quality of life improvements to the game:

General changes: 

  - Changed the color and sprite of some pieces/blocs for the game to be easier on the eye with default skin.

  - Changed the general controls to reflect more the ones of other tetris games.

  - Added wallkicks to the 180 degrees rotation to reflect more the result of other games that have this type of rotation.

Practice tool upgrades:

  - Added the ability to do ctrl+Z/Y to undo/redo a previous piece placement or a drawing on the board.

  - Added a warning sign that tells if the perfect clear solver is using pieces that are out of the current field of view

  - Added a way to know what is the saved piece depending on the chosen solve on the perfect clear solver

bugfixes:

  -Fixed bugs related to using the downstack algorithm at the same time as the perfect clear solver