How to get old extensions to work in newer versions of Visual Studio (specifically, how to use the "Visual Studio 2013 Color Theme Editor" in VS "14")

I’ve been playing around with VS “14” and the new C# 6 features, but the default theme is burning my eyes out. I tried to install the Visual Studio 2013 Color Theme Editor, but it threw the following error: You can get around this by modifying the manifest file. Open “ColorThemeEditor.vsix” using a program like 7-Zip (the file is just a zip file). Extract the “extension.vsixmanifest” file and open it in a text editor (Notepad is fine). Look for the following section: Note the left square bracket, but the right parenthesis. Here’s the meaning (you can »