feat: adjust mechanism to toggle credits screen

[HASH-0021]

Changes:

• Fixed issue with interaction dialogue for restroom being after quest dialogues.
• Fixed the typo for receiveQuest function.
• Currently the NPCs shown in the loading screen are random. This can result in same NPCs shown multiple times. Fixed this issue by adjusting logic for the random NPC selection. They are still random but unique.
• Incorrect use of anim keyword in library interaction of "start" map is fixed. Previously this results in console error.
• NPCs in loading screen are now facing right side (the direction in which they are moving).
• "dialog" html element includes overflow-y styling without any fixed height styling. Adjusted this to make the longer dialogues scrollable.
• Added debug mode shortcut to help section.
• Adjust mechanism to toggle credits screen.
  • Issue with credits screen shortcut ("o") only working in "start" map is fixed.
  • Added playerScenes constant to constants.js file so that it can be used in logic determining whether player can be present in those scenes.
  • Added the button shortcut "o" in kplayCtx.js file for "credits" button.
  • Player can now toggle credits screen only from the scenes mentioned playerScenes constant using either "Credits" button or "o" key.
  • Adjusted styling and text for exit button inside credits screen.
  • Canvas is now properly focused when using credits button.

[r4pt0s]

Good job @HASH-0021 🙌🏻🎉