Minor Feature: Seasons v1

[mathew-tran]

Should also do days in here: Monday, Tuesday, Wednesday, etc..

• Every 30 days, a season will pass. There are 4 seasons: Spring, Summer, Fall, Winter
• The clock UI should say what season it is
• The seasons will change the times at which it will be dark and light out

[mathew-tran]

merged in: https://github.com/mathew-tran/IdleCity/commit/5c2743cafd4d0c2461b8046ae365c8ed313a5750

I didn't add the light changes, might do that a bit later.

Would be ideal if I can do the light changes and slight graphic changes based on the season.

For example: when it's winter, the grass tiles turn into snow tiles. When it's fall, grass it yellow

But this would not just affect tiles. it'd have to affect everything.

Currently probably would need to be sprite replacements.