Add setting to change the cwd of the Powershell Integrated Console

package.json

@@ -640,6 +640,11 @@
           "default": "BlockComment",
           "description": "Controls the comment-based help completion behavior triggered by typing '##'. Set the generated help style with 'BlockComment' or 'LineComment'. Disable the feature with 'Disabled'."
         },
+        "powershell.cwd": {
+          "type": "string",
+          "default": null,
+          "description": "An explicit start path where the Powershell Integrated Console will be launched. Both the PowerShell process and the shell's location will be set to this directory. Predefined variables can be used (i.e. ${fileDirname} to use the current opened file's directory)."
+        },
         "powershell.scriptAnalysis.enable": {
           "type": "boolean",
           "default": true,

src/process.ts

@@ -112,6 +112,7 @@ export class PowerShellProcess {
                 shellPath: this.exePath,
                 shellArgs: powerShellArgs,
                 hideFromUser: !this.sessionSettings.integratedConsole.showOnStartup,
+                cwd: this.sessionSettings.cwd
             });
 
         const pwshName = path.basename(this.exePath);

src/settings.ts

@@ -101,6 +101,7 @@ export interface ISettings {
     sideBar?: ISideBarSettings;
     pester?: IPesterSettings;
     buttons?: IButtonSettings;
+    cwd?: string;
 }
 
 export interface IStartAsLoginShellSettings {
@@ -257,6 +258,8 @@ export function load(): ISettings {
             //   is the reason terminals on macOS typically run login shells by default which set up
             //   the environment. See http://unix.stackexchange.com/a/119675/115410"
             configuration.get<IStartAsLoginShellSettings>("startAsLoginShell", defaultStartAsLoginShellSettings),
+        cwd:
+            configuration.get<string>("cwd", null),
     };
 }