Style fixes

- Re-order function declarations in padded_byte_array.h
- Put return type on new line for encoding_symbol.cpp and padded_byte_array.cpp
- test/parsed.cpp has astyle fixes
- Re-order constants in include/parameters/internal_constants.h
Make all functions in partition constant member functions.
data_utils almost done.

get<array_source_block_decoder, array_data_decoder> still left to do.