Add options in tool.py to keep substitution as is from input

[polopi]

version: 0.3.54

When using the tool.py script to convert from a HOCON-like file to HOCON, it resolves the substitutions. HOCON-like means a YML/Properties/Json file with HOCON syntax enhancement.

It is expected when converting to native format, since this new syntax is not supported, but I would expect to keep the substitutions as is in HOCON file format