Fixes #89

* Upgrade to Simplify.DI 3.0

Version/Release notes set

Upgrades to:

Microsoft.Owin 4.0.1
Simplify.DI 2.1.0
Simplify.System.Sources
Simplify.Templates 1.5.1
and others

Version/Release notes set

Version set

Breaking changes

* Switched to Microsoft.AspNetCore process pipeline instead of Microsoft.Owin
* App.config/Web.config settings support dropped, switched to IConfiguration based settings
Other changes
* .NET 4.5.2 version upgrade to .NET 4.6.2
New Features
* Microsoft.AspNetCore support with it's all features (SPA support, static files etc.)
* .NET Standard 2.0 support
* Status Code exact controller responses like Ok(), NoContent()
* StatusCode controllers response
* Controllers wrappers for main responses to shorten code without new keyword
* Possibility to use Simplify.Web as a non-terminal middleware for SPA to only process API request and forward other requests to SPA server
* Option to disable static files handling
Bug fixes
* Request empty relative path check fix

Fixes #76

Merge branch 'feature/76' into develop

Version/release notes set

Version update