Invoices v1.3.0.0

Description

Changelog v1.3.0.0:
- Courseplay custom fields are now listed.
Changelog v1.2.0.0:
- Fix UI-Bug at prices (done by Bz455)
Changelog v1.1.0.0:
- Own text can be defined for each entry
- Own price can be defined for each entry
- Position "Goods" with unit liter added

You do work for someone else?
Then just invoice your working time!

With this mod you can send invoices to another farm. There are predefined activities for this.
In the main menu you can create and pay invoices.