Add uri_builder::append_path_raw(...) to allow adding elements to path intentionally beginning with '/' ("//" will results in the final path value) (#958)

* add append_path_raw() to uri_builder

* modify implementation details

* modified test case

* fixed append_path_raw and included a testscase for a trailing slash with that API

* update submodule to vcpkg master due to the NuGet hash changes

* Avoid double encoding through set_path and add tests. Extract single slash string comparison. Reduce string copy count. Add VS Code settings and launch.

* Optimize append_path similarly.

* Also optimize append_query.

* Also optimize other uri_builder things.

* Avoid self references.

Author: dangrif

.vscode/launch.json

@@ -0,0 +1,19 @@
+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "(Windows) Launch Debug Tests",
+            "type": "cppvsdbg",
+            "request": "launch",
+            "program": "${workspaceFolder}/build.debug/Release/Binaries/test_runner.exe",
+            "args": ["*testd.dll"],
+            "stopAtEntry": false,
+            "cwd": "${workspaceFolder}/build.debug/Release/Binaries",
+            "environment": [],
+            "externalConsole": true
+        }
+    ]
+}

.vscode/settings.json

@@ -0,0 +1,8 @@
+{
+    "files.watcherExclude": {
+        "**/.git/objects/**": true,
+        "**/.git/subtree-cache/**": true,
+        "**/node_modules/*/**": true,
+        "**/vcpkg/**": true
+    }
+}

Release/include/cpprest/base_uri.h

@@ -14,10 +14,9 @@
 #pragma once
 
 #include <map>
-#include <memory>
 #include <string>
 #include <vector>
-#include <functional>
+#include <utility>
 
 #include "cpprest/asyncrt_utils.h"
 #include "cpprest/details/basic_types.h"
@@ -421,4 +420,4 @@ namespace web {
         details::uri_components m_components;
     };
 
-} // namespace web
+} // namespace web