Use copy for test fixtures

.vscode/launch.json

test/fixtures/armory/base.bib

test/fixtures/armory/base.tex

test/fixtures/armory/bibtex_base.tex

test/fixtures/armory/empty

test/fixtures/armory/import_base.tex

test/fixtures/armory/import_sub.tex

test/fixtures/armory/include_base.tex

test/fixtures/armory/include_sub.tex

test/fixtures/armory/input_base.tex

test/fixtures/armory/input_macro.tex

test/fixtures/armory/input_parentsub.tex

test/fixtures/armory/intellisense_base.tex

test/fixtures/armory/intellisense_glossary.tex

test/fixtures/armory/linter_base.tex

test/fixtures/armory/linter_sub.tex

test/fixtures/armory/magic_invalid.tex

test/fixtures/armory/magic_option.tex

test/fixtures/armory/magic_program.tex

test/fixtures/armory/magic_root.tex