Support for F25

[vkrizan]

This adds fixes and support for Farming Simulator 25.

It additionally adds these changes:

• shows game version in titles to support FS22 and FS25
• starts economy with March (first spring month in-game) to match the game
• removes unnecessary fractions of prices on economy screen
• recognizes contributors in the copyright
• increases the version to 1.23.0
• refactors economy module

Fixes #22

Unfortunately, the player position is no longer provided by the game.

[gbruckner]

Patched my installation with this files, its up and running with FS25 and looking good so far.

[msdsuter]

Wow, thanks a lot for this contribution @vkrizan !

I'm a bit crowded with work and private stuff right now and wasn't able to do it by myself.
I will check this as soon as possible, but for what i've seen already it's looking quite good.

Cheers

[vkrizan]

@MSDigital no worries. Feel free to go through it once you get some time. Going commit by commit might speed up the review.

Cheers.