tugger-wix: Sanitise characters in Directory/ComponentGroup Id's.

[andrewleech]

I'm using PyOxidizer msi functionality for the first time with an application using wxPython. This package has a bunch of files with @ in the filenames which threw errors from wix:

D:\src\wsl-usbip-gui\build\x86_64-pc-windows-msvc\debug\msi_installer\wxs\install-files.wxs(6517) : error CNDL0014 : The DirectoryRef/@Id attribute's value, '[email protected]_MESSAGES', is not a legal identifier.  Identifiers may contain ASCII characters A-Z, a-z, digits, underscores (_), or periods (.).  Every identifier must begin with either a letter or an underscore.

D:\src\wsl-usbip-gui\build\x86_64-pc-windows-msvc\debug\msi_installer\wxs\install-files.wxs(6524) : warning CNDL1126 : The ComponentGroup/@Id attribute contains invalid characters for an identifier. Being able to use invalid identifier characters for a ComponentGroup identifier has been deprecated.

I saw there was already some character cleanup in the Id generation for these elements, but it didn't quite cover everything.

This PR enforces only the characters allowed according to the reported error above.