Support virtual path deployment

[realLiangshiwei]

Resolve #4089

[maliming]

For angular developers can refer to this article: http://codebuckets.com/2018/05/26/hosting-angular-in-iis-under-an-existing-website/

[hikalkan]

By angular developers, do you mean @mehmet-erim & @armanozak 😄

[maliming]

I mean for those developers who deploy angular in IIS sub-applications. They can refer to the above article to solve the problem.

[realLiangshiwei]

I added AbpApplicationPathViewComponent used to set abp.appPath value, but it is not added to the startup template by default.
For developers who deploy using virtual paths, please add the following code to your module:

Configure<AbpLayoutHookOptions>(options =>
{
        options.Add(LayoutHooks.Head.Last,
        typeof(AbpApplicationPathViewComponent));
});

It uses layout hooks to add scripts to the end of head :

<script type="text/javascript">
   var abp = abp || {}; abp.appPath = '<your virtual path>';
</script>

[hanntd]

Was this issue fixed for the latest abp framework version (7.0.1)? I'm using this version and having this issue when deploying to IIS as virtual application.