Added a multi project launch profile for MSVS (#8876)

This allows to start all servers in debug mode automatically in MSVS >= 17.11
See https://devblogs.microsoft.com/visualstudio/multi-project-launch-configuration/ for details.

.gitignore

@@ -116,6 +116,7 @@ Thumbs.db
 .vs
 *.VC.db
 *.VC.opendb
+*.slnLaunch.user
 
 /.idea/.name
 /.idea/misc.xml

rAthena.slnLaunch

@@ -0,0 +1,27 @@
+[
+  {
+    "Name": "All Servers",
+    "Projects": [
+      {
+        "Path": "src\\login\\login-server.vcxproj",
+        "Action": "Start",
+        "DebugTarget": "Local Windows Debugger"
+      },
+      {
+        "Path": "src\\char\\char-server.vcxproj",
+        "Action": "Start",
+        "DebugTarget": "Local Windows Debugger"
+      },
+      {
+        "Path": "src\\map\\map-server.vcxproj",
+        "Action": "Start",
+        "DebugTarget": "Local Windows Debugger"
+      },
+      {
+        "Path": "src\\web\\web-server.vcxproj",
+        "Action": "Start",
+        "DebugTarget": "Local Windows Debugger"
+      }
+    ]
+  }
+]