Implement xml schema and update build tool

[simon-bourque]

TASK

Description:

Implement an xml schema for the currently existing resources. Modify the build tool to parse xml instead of using command line arguments.

Motivation:

Having our resources saved as xml files will allow them to easily be parsable by any future tool we may need to develop. Implementing an xml schema will ensure that the syntax and rules for our files will be consistent everywhere. Having them as xml files will also make them more human readable which will be especially useful when diffing or merging them.

Completion Criteria:

• Xml files verifiable using xml schema
• Xml schema should be implemented for the currently used types of textures
• Convert currently existing resources in the sample games to xml
• Build tool can convert the xml files into binary files for the engine to load
• Build tool can take in files or folders as arguments