Allure.Xunit improvements (#461)

* Use common failed/broken algorithm by allure-xunit

* Remove obsolete allure-xunit's example

* Remove false warning for skipped theories (#421)

* Use the common skip reason for test plans

* Remove separate project for xunit reporter

* Consolidate Allure.Xunit under single namespace

* Remove obsolete API from Allure.Xunit

  - using-style steps/fixtures:
      - Allure.Xunit.AllureBefore
      - Allure.Xunit.AllureAfter
      - Allure.Xunit.AllureStep
      - Allure.Xunit.AllureStepBase
  - Async attachment functions in Allure.Xunit.AllureAttachments
  - Unused internal methods of AllureXunitHelper that had accidentally
    leaked into public API:
      - StartTestContainer
      - StartTestCase
      - MarkTestCaseAsFailedOrBroken
      - MarkTestCaseAsPassed
      - MarkTestCaseAsSkipped
      - FinishTestCase
  - The Allure.Xunit.Steps class
  - AllureXunitAttribute and AllureXunitTheoryAttribute
    (not used anymore)

* Fix allure-xunit README

* Make internal API hidden from public

* Make second reporter resolution more strict (#412)

Now, it only considers assemblies with names matching the
*reporters* pattern.

* Set Allure.Xunit's TFMs to netstandard2.0 and netcoreapp3.1

* Remove redundant code from AllureXunitHelper

* Ensure proper casing at Allure.Xunit fs names

.github/labeler.yml

@@ -19,8 +19,8 @@
 "theme:xunit":
   - changed-files:
     - any-glob-to-any-file:
-      - "Allure.XUnit/**"
-      - "Allure.XUnit.Tests/**"
+      - "Allure.Xunit/**"
+      - "Allure.Xunit.Examples/**"
 
 "theme:nunit":
   - changed-files:

.github/workflows/release.yml

@@ -51,16 +51,16 @@ jobs:
         run: |
           sed -i -e '/"$ref"/s|/allure-csharp/[^/]*|/allure-csharp/${{ env.release_version }}|g' ./Allure.NUnit/Schemas/allureConfig.schema.json
           cat ./Allure.NUnit/Schemas/allureConfig.schema.json
-          sed -i -e '/"$ref"/s|/allure-csharp/[^/]*|/allure-csharp/${{ env.release_version }}|g' ./Allure.XUnit/Schemas/allureConfig.schema.json
-          cat ./Allure.XUnit/Schemas/allureConfig.schema.json
+          sed -i -e '/"$ref"/s|/allure-csharp/[^/]*|/allure-csharp/${{ env.release_version }}|g' ./Allure.Xunit/Schemas/allureConfig.schema.json
+          cat ./Allure.Xunit/Schemas/allureConfig.schema.json
           sed -i -e '/"$ref"/s|/allure-csharp/[^/]*|/allure-csharp/${{ env.release_version }}|g' ./Allure.SpecFlowPlugin/Schemas/allureConfig.schema.json
           cat ./Allure.SpecFlowPlugin/Schemas/allureConfig.schema.json
           sed -i -e '/"$schema"/s|/allure-csharp/[^/]*|/allure-csharp/${{ env.release_version }}|g' ./Allure.Net.Commons/allureConfig.Template.json
           cat ./Allure.Net.Commons/allureConfig.Template.json
           sed -i -e '/"$schema"/s|/allure-csharp/[^/]*|/allure-csharp/${{ env.release_version }}|g' ./Allure.NUnit.Examples/allureConfig.json
           cat ./Allure.NUnit.Examples/allureConfig.json
-          sed -i -e '/"$schema"/s|/allure-csharp/[^/]*|/allure-csharp/${{ env.release_version }}|g' ./Allure.XUnit.Examples/allureConfig.json
-          cat ./Allure.XUnit.Examples/allureConfig.json
+          sed -i -e '/"$schema"/s|/allure-csharp/[^/]*|/allure-csharp/${{ env.release_version }}|g' ./Allure.Xunit.Examples/allureConfig.json
+          cat ./Allure.Xunit.Examples/allureConfig.json
           sed -i -e '/"$schema"/s|/allure-csharp/[^/]*|/allure-csharp/${{ env.release_version }}|g' ./Allure.SpecFlowPlugin/allureConfig.Template.json
           cat ./Allure.SpecFlowPlugin/allureConfig.Template.json
           sed -i -e '/"$schema"/s|/allure-csharp/[^/]*|/allure-csharp/${{ env.release_version }}|g' ./Allure.Features/allureConfig.json