[build] remove anything related to AppVeyor (#666)

As part of consolidating our CI setup, we now have Windows builds running on Jenkins. This means we no longer need to use AppVeyor at all, which is a good thing. AppVeyor is not a CI system well known by other folks working on the Xamarin or Mono teams, where Jenkins is mostly used.

Other changes:
- Updated `.gitignore` for files appearing on Windows: `UpgradeLog.htm` from VS upgrading projects and `*.obj` from running the C tests

.gitignore

@@ -42,6 +42,8 @@ packages
 /tests/android/**/.project
 .gradle/
 .idea/
+*.obj
+UpgradeLog*.htm
 
 ### Xcode ###
 DerivedData/

README.md

@@ -4,8 +4,8 @@
 |---------------------------|-----------------------------|
 | [![windows-vs-x86][1]][2] | [![osx-clang-x86][3]][4]
 
-[1]: https://ci.appveyor.com/api/projects/status/lnmi5dh2ukm1n79o/branch/master?svg=true
-[2]: https://ci.appveyor.com/project/tritao/embeddinator-4000/branch/master
+[1]: https://jenkins.mono-project.com/view/Xamarin.MaciOS/job/embeddinator-4000-windows/badge/icon
+[2]: https://jenkins.mono-project.com/view/Xamarin.MaciOS/job/embeddinator-4000-windows/
 [3]: https://travis-ci.org/mono/Embeddinator-4000.svg?branch=master
 [4]: https://travis-ci.org/mono/Embeddinator-4000
 

build.cake

@@ -59,13 +59,6 @@ Task("Tests")
     .IsDependentOn("Run-C-Tests")
     .IsDependentOn("Run-Java-Tests");
 
-Task("AppVeyor")
-    .IsDependentOn("Build-Binder")
-    .IsDependentOn("Android-Tests")
-    .IsDependentOn("Build-CSharp-Tests")
-    .IsDependentOn("Run-C-Tests")
-    .IsDependentOn("Build-Java-Tests");
-
 Task("Jenkins")
     .IsDependentOn("Build-Binder")
     .IsDependentOn("Android-Tests")