TensorVis: Remove doc templates, use pragma once, add missing copyright.

[petersteneteg]

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Cpp-Linter Report ⚠️

Some files did not pass the configured checks!

clang-tidy (v19.1.1) reports: 1 concern(s)

• tensorvis/tensorvisio/include/inviwo/tensorvisio/processors/tensorfield3dimport.h:43:34: warning: [cppcoreguidelines-special-member-functions]

  class 'TensorField3DImport' defines a default destructor but does not define a copy constructor, a copy assignment operator, a move constructor or a move assignment operator

     43 | class IVW_MODULE_TENSORVISIO_API TensorField3DImport : public Processor {
        |                                  ^

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Cpp-linter Review

Used clang-tidy v19.1.1

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clang-tidy diagnostic

tensorvis/tensorvisio/include/inviwo/tensorvisio/processors/tensorfield3dimport.h:43:34: warning: [cppcoreguidelines-special-member-functions]

class 'TensorField3DImport' defines a default destructor but does not define a copy constructor, a copy assignment operator, a move constructor or a move assignment operator

   43 | class IVW_MODULE_TENSORVISIO_API TensorField3DImport : public Processor {
      |                                  ^

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