Fix git casing issues across all directories

fix-casing-issues.rb

# can just run this in pry

files = `git ls-files | grep Wrongcase`
files.split("\n").each { |file| system("git mv #{file} #{file.gsub('Wrongcase', 'WrongCase')}") }

I ran this to fix a repository that was set up in Windows (which is case-insensitive).