Refactor indentation checker and check for 2 spaces #108
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Closes #107. @kotp asked me to open a PR in this comment. The indentation checker currently just checks to see if the indentation for each line is not more than 2 spaces different than the line the line that proceeds it. This PR ensures that the difference in indentation is either two spaces or zero.
The PR also refactors the indentation checker to improve readability and performance based on the suggestion in this comment