Consolidate 32-bit and 64-bit tagging tools.

[natestuder]

Make 64-bit a tagging tools runtime option instead of needed separate tools for 32 and 64 bit. The main changes would be updating the code to handle the changing size of addresses/registers, updating the file parsing code to return the correctly sized type, and updating the ELF parser to work for both 32-bit and 64-bit ELF files.

The latter change looks to be the most difficult.