Removed the app builds for VS2013 to reduce workload and start removal of...

Removed the app builds for VS2013 to reduce workload and start removal of VS2013 as supported platform

Doc/changelog.docu

@@ -9,6 +9,11 @@
 
 <tr valign=top><td><b>8.0</b> (?/?/?)</td><td>
 
+<b>Breaking changes:</b>
+<ul>
+<li>Don't run and test on VS2013 anymore. As VS2013 still lacks some C++11 features, we remove it from our list of supported platforms</li>
+</ul>
+
 <b>Core</b>
 <ul>
 <li>TriConnectivity: Added two functions split_edge and split_edge_copy to mask the PolyConnectivity functions of the same name (Prevents creation of valence 2 vertices on trimeshes)</li>

Doc/compiling.docu

@@ -12,12 +12,11 @@ supports at least C++11
 <table>
 
 <tr><td> Linux </td><td>
-gcc   >= 4.8.x<br>
+gcc   >= 6.3<br>
 clang >= 3.3<br>
 </td></tr>
 
 <tr><td> Windows </td><td> 
-Microsoft Visual Studio 2013<br>
 Microsoft Visual Studio 2015<br>
 Microsoft Visual Studio 2017<br>
 </td></tr>