make program header printing more pretty

[m4b]

There's lots of room for improvement:

1 we could do some cool unicode block char tree printing for each phdr
2. color code the types better
3. remove the extra field names
4. add a header with the field names to remove redundant information
5. do better alignment with field columns
6. add second indented line (like objdump) with the flags and alignment, since its less important

[m4b]

This is done