Move calo decode templates

The parser was confused by either the presence of two templated functions in the calo decoding algorithm header or the anonymous namespace that contained one of them. As a result the sequence generation for hlt1_pp_calo was broken. The pregenerated sequence was fine.

This was encountered while rebasing !552 (merged). Once that is merged, all sequences will be generated and built as part of the pipeline, so I don't think adding a build of hlt1_pp_calo to the CI is necessary at this point; also in view of !547 (merged)