Turing β-0.8

Fixed

• Width of side panel [a1f4ff8]
• Bug when displaying breakpoint message when message is not set [2bb96b9]
• "Stop" button when program is running [ed27186]
• Performance bottleneck caused by too frequent redundant graph updates [621dc46]

Added

• Theme engine [1a8932a]
• Theme customizer [214a3a9]
• Dark green theme [84a6bc8]
• Dark red theme [5d1f8c0]