The Flatpacker 1001 can now make flatpacks for computers. (#23471)

The Flatpacker 1001 can now make flatpacks for computers. (#23471)

* moved ComputerBoardComponent to Content.Shared

* made flatpacker accept computer boards

* made flatpack system and ui function with computer boards

* fixed it so that flatpacks of computers are correctly coloured to fit their computer board colour

* unhardcoded the computer flatpack assembly cost

* Combined GetFlatpackCreationCost(...) with GetflatpackCreationCostForComputer(...)

* removed code duplication in SharedFlatpackSystem

* removed code duplication from FlatpackCreatorMenu.xaml.cs

* remove code duplication from FlatpackSystem (on the server)

* fixed indentation error