Add script for renaming + customizing the template project

There's currently a lot of stuff you have to rename to create your own project from this template project. It would be nice to have a script that goes through and renames stuff where necessary. Currently what I can think of that needs renaming:

• license headers for stuff that isn't generated by aruwlib or modm
• project folder name, other folder names presumably
• project name in project.xml used for generating other stuff
• anything in doc generation?