sanitize uppercase filenames used in headers when adding new files to the project #36
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For #define something in C, only alphanumeric and _ are allowed.
When creating a new file in the project, esp. headers, some ifdef dance is added, to prevent double inclusion. This take the file name literally.
For Categories, it's common to use NSSomeClass+Category as name, and that + sign breaks build.
Therefore sanitize the generated uppercase header file name, replace any non alphanumeric and _ with _ before replacing the string in the template.