This commit fixes two problems with HeaderToModel: we no longer emit
fields for padding and do not change the name if it's identical to the
old `.name()`.
This issues led to create fields for padding and, in case the entity was
originally missing the `CustomName`, to set `CustomName`s to the
generated name.
This analysis will be used for the following features:
1) Edit Type in the Model
2) Edit Function Prototype in the Model
3) Add Type to the Model
It takes C code as an input, parses it and produces a Model
type that represents the C type.