can you add a clear button

[ljhui]

nice tool, I like it.
I'd like there is a clear button that do what its name says. everytime after I write a short program and start to write another, I have to press ctrl+A to select all code and press backspace to sweep it. certainly, I also can refresh the webpage or create new template use drop-arrow button, but a clear button is more direct. I don't like
preset code, so I'd like a clear button, maybe others like a reset button.

[x1unix]

@ljhui implemented in #93 and will be shipped in the next stable release.