Version 0.6.3

Changelog for version 0.6.3:

• Added one more deterministic test case for Level 54 (Multiplication).
• Fixed an issue where a key for deleting selected components was not working.
• Fixed a bug in the XOR gate component showing nonexistent loops.
• Fixed an issue where a solution was saved under its old name instead of the new name after being renamed.
• Fixed histograms not displaying when bins are very small.
• Components can now be selected and deselected during a simulation.
• Selected components now update dynamically while panning and zooming while selecting.