Team 2 UI - Progress merge

[The-AhmadAA]

This merge brings in improvements to in-game UI and effects, specifically:

• Screen shake - This is an effect to be used for adding feel to boss encounters, where a boss entering or performing a heavy attack causes a screen shake to be applied to the map grid, background and entities in the game
• Tile highlighting improvements - tile highlighting now only occurs when a tower is selected for placement, and will use colour to indicate the validity of the action (Green for valid tower placement, red otherwise)
• Wave timer improvement - The wave timer now only appears between waves and disappears once the next wave has started
• Pause menu fixes - The pause menu is now implemented as a Window, which prevents the buttons from escaping. Inputs outside the pause menu now do not register. Pause menu positioning is now dependent on screen size and should center automatically.

General UI improvements

• The skin file has now been updated with an easier to read font that was voted on by the design committee, and team 3's ButtonFactory class has been updated to use this.
• Buttons now have padding to improve the look and white space around text.
• Buttons have been updated throughout the project to use this new configuration.
• Currency display now flashes when a build is attempted with insufficient funds.
• EngineerCount display and Tower build buttons now have tooltip pop ups

Please feel free to ask questions and provide feedback as necessary, thanks!

[BlairCannon97]

Changes look good, great list of enhancements!

[meganroxburgh]

All looks good! I agree the game area ui should show the name of the level!

[The-AhmadAA]

All looks good! I agree the game area ui should show the name of the level!

Ok, I've added this to my list of To-dos, will implement and should come through in the next PR. Thanks!