[examples] Update examples list and more inconsistencies

[anstropleuton]

CHANGES

• README.md:

  • Updated miss-matched stars count (from examples source files)
  • Updated miss-matched created version info (assumed true from examples source files)
  • Updated miss-matched last-updated version info (taken the larger value from README.md vs. examples source files)
  • Updated miss-matched author (assumed true from the contributor from commit history of raylib)
  • Added entries from examples source files not present in the examples list in README.md
  • Addressed renamed GitHub user account (codifies -> chriscamacho) and other miss-matched name renames
  • Removed duplicate example entry (core_window_should_close)

• examples/*/*.c:

  • Added difficulty/complexity rating from missing source files (thank Ray for providing the rating)
  • Inconsistent Copyright author
  • Addressed renamed GitHub user account (codifies -> chriscamacho)

Note: The README.md file changes were supposed to be in different commit but then git came along and ruined my day (idk how to use git, its too complicated for me 😅 ). I'm sorry about that. Now it's one large changes + many small changes.

[raysan5]

@anstropleuton Nice! Thanks for the review! 👍😄