Added output file pattern matching

[Lethja]

Adds and documents printf like parameters to the --outputfile-pattern argument. This allows identical changes multiple anim files to be done in a very trivial way

Example:

mkdir left right
mv *.anim left/
python animDump  --mirror -o %p/../right/%n left/*.anim

[tapple]

merged. I messed around with help text formatting and figured out that RawHelpTextFormatter is the answer: 41e12e0

  --outputfile-pattern OUTPUTFILE_PATTERN, -o OUTPUTFILE_PATTERN
                        Output anim file path/name, with template substitution:
                            %n: input file name
                            %p: input file directory
                            %%: literal '%'
                        File extension will be appended automatically
  --time-scale ACTIONS, --tscale ACTIONS, --speed ACTIONS, -s ACTIONS
                        Adjust duration by the given factor eg:
                            2.0 for half-speed/double duration, or
                            0.5 for double speed/half duration

[Lethja]

merged. I messed around with help text formatting and figured out that RawHelpTextFormatter is the answer: 41e12e0

  --outputfile-pattern OUTPUTFILE_PATTERN, -o OUTPUTFILE_PATTERN
                        Output anim file path/name, with template substitution:
                            %n: input file name
                            %p: input file directory
                            %%: literal '%'
                        File extension will be appended automatically
  --time-scale ACTIONS, --tscale ACTIONS, --speed ACTIONS, -s ACTIONS
                        Adjust duration by the given factor eg:
                            2.0 for half-speed/double duration, or
                            0.5 for double speed/half duration

Great! I saw RawHelpTextFormatter in the documentation myself but the "raw" in the name made me think it would require indenting every help string manually. I'm glad that's not the case