Equivalent inner components now exchangeable. Fixed in/output pin order.

1. Previously, the creation of the inner components of a custom
component was fixated in the file, even though the same inner component
could either be described by a class, or a file. mapping.json now
dictates, which one to use.
2. Added the .json versions of all currently available
SubmodelComponents
3. Since pins are no longer addressed by index, but rather by name,
rectangular custom components were created with a more or less random
pin order, were inputs and outputs were mixed. This issue was fixed.