Content in _data folder should output the correct extension of resource content type

[hugopeek]

Case: I have 2 resources with alias "sitemap". One is being output as HTML, one as XML. Normally, MODX will warn you about double aliasses, but it's allowed when using different content types..

This results in Gitify storing the data from sitemap.xml in sitemap.html in the _data folder, meaning the actual sitemap.html disappears on gitify build --force. The problem would be solved if the file extension was .xml in the _data folder.

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[Mark-H]

Related to #113