Separating W3C Test files from Issues and Pull Request (#1119)

* Separating W3C Test files from Issues and Pull Request

 - Splitting the W3CTestSuite contents into W3CTestSuite and Issues
 - W3CTestSuite is now empty
 - W3CTestSuite contents will be automatically downloaded

* Apply Tests Split: updated SvgW3CTestRunner, Svg.UnitTests, Svg.Benchmarks

- The projects are modified to check if the W3C tests are downloaded, if not download it

* Resolved pull-request review issues

Author: paulushub

.gitignore

@@ -355,3 +355,9 @@ MigrationBackup/
 # JetBrains Rider
 .idea/
 *.sln.iml
+
+# W3C Test Suites
+Tests/W3CTestSuite/images
+Tests/W3CTestSuite/png
+Tests/W3CTestSuite/resources
+Tests/W3CTestSuite/svg

Tests/Issues/PassingTests.txt

@@ -0,0 +1,129 @@
+# List of test files relates to issues and pull-requests
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