Do not adjust adjust whitespace other than indent

[elenzil]

Similar to #59 , this is a request to just adjust the indent and leave non-indent aspects untouched.
Specifically, the indent operation eliminates any whitespace in front of a tag-closure \>.
This is problematic because other tools such as VisualStudio put a space there.
So indenting your .vcxproj file makes a whole lot of <blah \> -> <blah\> changes.