use tab instead of soft tab

[steinwaywhw]

Hi @prasmussen, this is related to glotcode/glot#5. I propose this change to make tabs tabs, instead of 4 spaces, but it is up to you. Hard tabs makes it easier to write makefiles.

[prasmussen]

Give me a couple of days to deploy this to glot.io.

[steinwaywhw]

Thank you!

[prasmussen]

I had to revert this change after doing some testing (5f98d85).
Languages like Elm won't compile when tabs are used in the source code and Haskell gives a compiler warning by default when tabs are used.
One way to solve this would be to enable tabs per language or have a setting in the editor to enable tabs. I might look into this at a later time.