Initial central pre/postExec/Include support for CA-based transforms

Initial support for preExec, postExec, preInclude and postInclude for the CA-based transforms. Current clients are also already migrated.

A quick overview:

• preExec and preInclude only change flags
• postExec and postInclude change the final configuration

Order:

• flag autoconfiguration from runtime arguments
• preInclude
• preExec
• configuration
• postInclude
• postExec
• run

Will also be presented at the SW coordination next week, but I think this can be merged as it is useful for further development.

/cc @wlampl @jchapman