Support all functions of javaluator

[Teifun2]

Description of Changes

Please provide a summary of the changes, including:

• What was changed:
  The expression for pdf-organizer with "Custom Page Order" was restricted to basic inputs only.
  The underlying javaluator can do many more things.
  https://www.javadoc.io/doc/com.fathzer/javaluator/2.0.0/com/fathzer/soft/javaluator/DoubleEvaluator.html

The matcher now accepts all these functions / symbols

• Why the change was made
  Functions like modulo, abs, floor, ceil, can be vital for reordering properly. This should now be possible.

• Any challenges encountered
  Finding the documentation of the underlying expression / what is possible or not.

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Checklist

General

• I have read the Contribution Guidelines
• I have read the Stirling-PDF Developer Guide (if applicable)
• I have read the How to add new languages to Stirling-PDF (if applicable)
• I have performed a self-review of my own code
• My changes generate no new warnings

Documentation

• I have updated relevant docs on Stirling-PDF's doc repo (if functionality has heavily changed)
• I have read the section Add New Translation Tags (for new translation tags only)

UI Changes (if applicable)

• Screenshots or videos demonstrating the UI changes are attached (e.g., as comments or direct attachments in the PR)

Testing (if applicable)

• I have tested my changes locally. Refer to the Testing Guide for more details.

[Frooodle]

I cant think of a usecase why any user would want to sin(x) for a pdf page index, Can you think of examples for any of these?

[Teifun2]

@Frooodle Yes. I was also wondering if i should include all functions or only the ones i need / can think of a need.

But in the end i decided to allow them all, as all of them to my understanding can be computed by javaluator. Why restrict something just because i cant think of a usecase.

If you would rather have the ones that are actually usefull that would be fine for me aswell. I was only looking for modulo initialy.