Resolve "Use pkg-config to find muparse"

What does this MR do?

Removes Findmuparser and uses pkg-config.

Can this MR be accepted?

• I've read contribution guide
• Implemented
• [ ] Added/Updated tests
• Added/Updated documentation
• Pipelines passing

• Delete branch option set
• Fast-forwaded git merge is possible
• Added entry to CHANGELOG.md

Related issues

Closes #62 (closed)