Tofu v0.4

What's new:

• You can now pass CLI arguments as integer variables, if the value can be converted into one
• Fixed being able to attempt a division by 0 in calcint
• Added while loops and break
• goto has been renamed to call
• More startup syntax checks, they replace the runtime equivalents, should improve performance slightly for loops and recursion
• Added readstr for reading user input
• Improvements on string parsing

Full Changelog: v0.3.1...v0.4