(#515) Automatically enable Omnisharp usage

Once downloaded, the Cake.Bakery.exe can be added to the Omnisharp
configuration file, so that Omnisharp knows where to find the binary,
and then once the file is updated, force a restart of the Omnisharp
Server so that everything just "works".

Here we are relying on the fact that any VSCode extension can call a
registered command from another extension, as long as the name is
known.  In this case, the `o.restart` command, which the Omnisharp
Extension registers.

src/cakeMain.ts

@@ -124,6 +124,21 @@ async function _registerCakeBakery(context: vscode.ExtensionContext) {
             fs.mkdirSync(getOmnisharpUserFolderPath());
         }
 
+        if (fs.existsSync(getOmnisharpCakeConfigFile())) {
+            // Read in file
+            //import omnisharpCakeConfig from getOmnisharpCakeConfigFile();
+            var omnisharpCakeConfig = JSON.parse(fs.readFileSync(getOmnisharpCakeConfigFile(), 'utf-8'))
+            console.log(omnisharpCakeConfig.cake.bakeryPath);
+            omnisharpCakeConfig.cake.bakeryPath = targetPath;
+            fs.writeFileSync(getOmnisharpCakeConfigFile(), JSON.stringify(omnisharpCakeConfig));
+
+            // lets force a restart of the Omnisharp server to use new config
+            vscode.commands.executeCommand('o.restart');
+        } else {
+            // create file
+            var newOmnisharpCakeConfig = { cake: { bakeryPath: targetPath }};
+            fs.writeFileSync(getOmnisharpCakeConfigFile(), JSON.stringify(newOmnisharpCakeConfig));
+        }
     } else {
         logger.logToOutput("Cake.Bakery has already been installed, skipping automated download and extraction.");
     }
@@ -219,8 +234,8 @@ async function _getCakeScriptsAsTasks(context: vscode.ExtensionContext): Promise
                     `Run ${taskNamePrefix}${taskName}`,
                     'Cake',
                     new vscode.CustomExecution(getCakeToolExecution({
-                        command: buildCommandBase, 
-                        script: file.fsPath, 
+                        command: buildCommandBase,
+                        script: file.fsPath,
                         taskName,
                         verbosity: config.verbosity
                     }, config, context)),
@@ -315,7 +330,7 @@ export function deactivate() {
 function getCakeToolExecution(
     cfg: ICakeTaskRunnerConfig,
     settings: ITaskRunnerSettings,
-    context: vscode.ExtensionContext) 
+    context: vscode.ExtensionContext)
     : (resolvedDefinition: vscode.TaskDefinition) => Thenable<vscode.Pseudoterminal> {
 
         return (_: vscode.TaskDefinition) => {
@@ -330,8 +345,8 @@ class CakeTaskWrapper implements vscode.Pseudoterminal {
 	private readonly closeEmitter = new vscode.EventEmitter<number>();
     public onDidClose: vscode.Event<number> = this.closeEmitter.event;
     private isCanceled = false;
-    
-    constructor(private cfg: ICakeTaskRunnerConfig, 
+
+    constructor(private cfg: ICakeTaskRunnerConfig,
         private settings: ITaskRunnerSettings,
         private context: vscode.ExtensionContext) {
     }
@@ -361,7 +376,7 @@ class CakeTaskWrapper implements vscode.Pseudoterminal {
             });
         this.writeEmitter.fire(`started command: ${proc.spawnargs.join(" ")}${os.EOL}`);
         let exit = 0;
-        
+
         proc.on('error', (error) => {
             this.setColorRed();
             this.writeEmitter.fire(`ERROR: ${error.name}${os.EOL}${error.message}${os.EOL}`);
@@ -376,7 +391,7 @@ class CakeTaskWrapper implements vscode.Pseudoterminal {
             const txt = data.toString();
             this.writeEmitter.fire(txt);
         });
-        proc.stderr.on('data', (data: Buffer) => { 
+        proc.stderr.on('data', (data: Buffer) => {
             const txt = data.toString();
             this.setColorRed();
             this.writeEmitter.fire(txt);
@@ -399,7 +414,7 @@ class CakeTaskWrapper implements vscode.Pseudoterminal {
 }
 
 interface ICakeTaskRunnerConfig{
-    command: string; 
+    command: string;
     script: string;
     taskName: string;
     verbosity: string;