BuildEngines type:Int, amount:Int, [flag:Str]
Build engines.
Attempts to build amount engines of the given type. The amount can be negative to scrap engines. The tech levels is automatically raised as necessary. The flag can be "N" to permit partial builds. If not all of the requested amount can be built, the command will report the amount not built in the variable Build.Remainder instead of failing.
Since: PCC 1.1.16, PCC2 1.99.9
