Break statement

Break statement does not work inside conditional statements in while loop.

Example:
```lua
require "ifj21"

function main()
	local foo : integer = 1
	
	while foo do
		if foo then
			break
		end
	end
	
	write("hello\n")
end

main()
```

Output:
```
Error at line: 311
Label does not exist!
```