Introduction of visuals and words list improvements

This is a HUGE update!
This update brings forward the key parts of the hangman game previously left out and will be the base of many versions to come.

• It introduces all new visuals to display lives by using the original hangman diagram
• Word place holder updates to include correct letters in the correct place in the word
• Minor user interface improvements with the removal of brackets in lists and large written info replaced by diagrams
• A shortened words list with the removal of all words under 3 letters long and the removal of some unusual or unexpected words
• The introduction of functions for easier code navigation, maintenance and reduced file size
• Increased code commenting for easier understanding of what's happening
• Along with minor bug fixes and improvements

You can view the full change log here: v1.2...v2.0

v1.2

This release adds the ability to guess whole words

v1.1: Merge pull request #1 from willh36/improvements

I've worked through the game and added multiple necessary improvements.

1. The player lives count can no longer go into negative figures.
2. I've removed some unnecessary variables to make the code simpler to understand.
3. I've commented more code for improved code interpretation ease.
4. I've fixed minor bugs such as:
   • Incorrect guess info displaying when the lives count has expired
   • Players on 0 lives having the ability to make a guess