Ref, env, pkg unit tests

src/completion/completer/environment.ts

src/completion/completer/macro.ts

src/core/cache.ts

src/core/file.ts

src/core/root.ts

src/language/definition.ts

src/outline/structure/latex.ts

src/utils/inputfilepath.ts

src/utils/utils.ts

test/units/01_core_file.test.ts

test/units/15_completion_macro.test.ts

test/units/16_completion_reference.test.ts

test/units/17_completion_environment.test.ts

test/units/18_completion_package.test.ts