Added option for execution speed and comments

[dgc08]

New features:

• Added option for the execution speed: Pressing the increase button will double the amount of instructions per second, the decrease button will half it
• Added Assembly-like comments with ;, cleanCode() moves any comment at the end of the line into a new one though (sorry that is my first time with regex)

Major changes:

• I changed the indexing for the registers and instructions from starting at 1 to starting at 0. I know you did that on purpose, but even my teacher said it should be starting at 0, there is no reason for it to start it at 1. If you are unhappy with this, you can always change it back tho

Minor changes / Bugfixes:

• Deleting a register will also pop() it from the registers array. This is helpful if you for example want to clear an output register quickly
• Previously, tst treated registers which don't exist like "full" registers, which is stupid as new registers are initialized with 0. Nonexistent registers are now treated like empty ones.
• Fixed bug that if there were too many registers, you could only see/scroll to the last ones
• Cleaned up some typos and refactored some parts of the code to be more readable