Revert "Add assembly prefix to assembly attributes"

This reverts commit 6e4fe8e5d7d9f6c9e3e652d1ab93ba1d67309c64.
Revert "Declare the add-in identity and dependencies using attributes"

This reverts commit c54127ffd60702ce56254c9a3b56bfd9ee3d4b8b.
Revert "Define add-in identity using custom attributes"

This reverts commit 0c8bfcf7fed8a4fda7adc75d4ffa89b83e3a433d.