Updating Starter Games - More descriptive names

Updating the names of objects and variables in some of the starter projects to make them less generic.

Also updating the README.md files of those starter games to better describe the mechanics and objects in the games.

Author: HelperWesley

examples/starting-beatemup/README.md

@@ -1,4 +1,3 @@
 # Beat'em up
 
-A 2D, side-view, beat'em up style game where the player controls a character that can move in the level and attack other characters who are trying to hurt him.
-Support for keyboard and mobile controls.
+A 2D side-scrolling beat’em up brawler where the player uses top-down style movement within a side-view camera angle. All movement, attacks, and hurt states use animations and animation timers. The player uses a separate attack collision object to detect hits on enemies, while enemies move toward the player and attack using their own collision mask objects to detect hits on the player. Boundaries keep the player within the play area of the screen. The game supports both keyboard and mobile touch controls.