fix: refactor and clean up code across multiple files

[Niravanaa]

🛠 Proposed Changes:

This PR improves code safety, memory management, and precision by initializing pointers, cleaning up dynamic allocations, refining type usage, and enhancing UI component flexibility.

📝 Details:

• Updated logging function in Global.h to use localtime_s for safer time handling.
• Initialized pointers to nullptr in EndScreenState.h, IntroState.h, MainGameState.h, MapEditorState.h, MapSelectState.h, OptionsState.h, and TitleState.h to prevent potential dereferencing of uninitialized pointers.
• Added destructor to Tower class to manage memory for critterTargettingStrategy.
• Changed return types of getBuyingCost and getTotalTowersPlaced to const in Tower and TowerGroup classes respectively.
• Updated ParallaxBackground and ParallaxLayer to use float instead of int for dimensions and positions, improving precision.
• Removed unnecessary dynamic memory allocations and replaced them with stack allocations where applicable.
• Cleaned up memory management in various classes, ensuring proper deletion of dynamically allocated objects.
• Adjusted volume slider constructor to accept float parameters for position.

[Niravanaa]

One thing to note is that when calling delete critter upon the death or the entry of a critter at the exit of the map, certain critters are spawned with different sprite animations overlayed.

For example, the FastCritter, which should just be a bee, has the slime texture rendered under-neath it in wave 2 .