Ping/Ping Thread inits, short __str__

A few global changes were made, like a short_str variable in all
classes that can be used to make the str() calls print a little less.
Currently only affects Ping/PingThread level

STDs
- adding short_str to cheats calls (“-c”, “-cs”, etc.)

STF
- added short_str class variable
- small formatting changes to __str__ method

IndivST
- added short_str variable
- when parsing thread number, using strip() instead of replace
- when creating ping thread, passing down short_str state (of True or
False)
- __str__ formatting changes

PingThread
- name changes to class variables
- added DataDirection (will be Up or Down)
- fleshed out __str__ method

Pings
- added size_string and speed_string class variable. This is so that
printouts are a little easier to read
- __str__ method has a few IF/ELSEs that are used to find the space
padding for each part