added @allure.title annotation support for fixtures

[rad96]

Fixes #210

[rad96]

tested it with allure-ee and free allure, works as expected

[sseliverstov]

1. Please, add tests for this improvement.
2. allure.title ads pytest mark to fixture function. It is unused by pytest framework but can be useful for getting given title from function attribute (see pytest code). Please, use this machinery instead of code inspection.
   Tnx!

[rad96]

1. Please, add tests for this improvement.
2. allure.title ads pytest mark to fixture function. It is unused by pytest framework but can be useful for getting given title from function attribute (see pytest code). Please, use this machinery instead of code inspection.
   Tnx!

@sseliverstov

1. Added tests in PR
2. I checked out how pytest manage marks for fixtures and, for me, looks like pytest don't support it in any way. Maybe my knowledge of pytest is not enough :(

[rad96]

Maybe we can use that solution temporary, and make issue for changing it?
Because, at least, that solution works, and issue was here for 2 years

[rad96]

1. Please, add tests for this improvement.
2. allure.title ads pytest mark to fixture function. It is unused by pytest framework but can be useful for getting given title from function attribute (see pytest code). Please, use this machinery instead of code inspection.
   Tnx!

Also found this in pytest issues, looks like markers don't work with fixtures right now:
pytest-dev/pytest#3960 (comment)

[sseliverstov]

Thank you @rad96