Changes related to the addresses displayed in the hex editor including: (#2708)

- Don't change base address when parsing pragma base_address, only
change on evaluation.

- Detect invalid base addresses that cause addresses to overflow 64 bits
in both pragma and popup.

- Calculate and display correctly the addresses at the end of files with
ending address at u64_max. Fixed cursor and selections as well.

- Ensure only unsigned integers are used to allow the use of the full
range of values for addresses using 64 bits.