Until now a lot of ways to handle a command were handling the pre-processing of the command differently.
So the source of the command can make a difference whether system variables can be used for example.
Now all use the same function to pre-process the commands.
- There were some unicode characters
- JPG file had wrong image type
- Documented the needed packages to build LaTeX documentation in Linux (still fails to build PDF dus to chapter count overflow)
Split the plugin related substitutions into separate files (per 10) to speed-up building docs.
Please note the use of indirect paths used in includes, needed to link those replacements from other directories.