Rename Inelastic Data Manipulation to Data Processor

[robertapplin]

Description of work

This PR renames the Inelastic Data Manipulation GUI to Data Processor. It only renames things that are user-facing. The relevant classes, files names, folders and documentation refs link will be renamed in a separate maintenance PR.

There is no associated issue.

To test:

1. Follow the instructions here to test.
   https://developer.mantidproject.org/Testing/Inelastic/DataManipulationTests.html

2. Build the docs-html target, and check the Data Processor interface documentation uses the correct name

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[jmborr]

Other files that may need update:

• is dev-docs/source/InelasticDataManipulationFileStructure.rst left for the maintenance issue? it's mostly a class diagram.
• I think point 19 of last test in file https://github.com/robertapplin/mantid/blob/0-rename-data-manipulation-to-data-processor/dev-docs/source/Testing/Indirect/DataReductionTests.rst needs to be updated
• I think file https://github.com/robertapplin/mantid/blob/0-rename-data-manipulation-to-data-processor/dev-docs/source/Testing/Inelastic/DataManipulationTests.rst should be updated

[robertapplin]

Other files that may need update:

• is dev-docs/source/InelasticDataManipulationFileStructure.rst left for the maintenance issue? it's mostly a class diagram.
• I think point 19 of last test in file https://github.com/robertapplin/mantid/blob/0-rename-data-manipulation-to-data-processor/dev-docs/source/Testing/Indirect/DataReductionTests.rst needs to be updated
• I think file https://github.com/robertapplin/mantid/blob/0-rename-data-manipulation-to-data-processor/dev-docs/source/Testing/Inelastic/DataManipulationTests.rst should be updated

Thanks, the structure.rst will be left for the maintenance issue. The other two I have updated in the latest commit

[github-actions]

👋 Hi, @robertapplin,

Conflicts have been detected against the base branch. Please rebase your branch against the base branch.

[jmborr]

looks 👌