Support attaching to running app (#85)

* add support for timeout on adb socket reads

* add debugger support for attaching to a process

* add new launch configuration and support for picking an Android process ID

* initial support for attaching to android process

* display enhanced quick pick list with pids and names

* add flag to prevent disconnect messages when not connected

* Retrieve all loaded classes during startup.
This allows us to identify breakpoints in anonymous classes that are already loaded.

* correct name of process picker command

* make PickAndroidProcess command private

* selectAndroidProcessID always returns an object

* make breakpoint setup a loop instead of recursive

* tidy some labels and error messages

* use a more consistent command for retrieving process names

* show pid list sorted by pid instead of name

* refactor some Android and ADB-specific functions
Check ANDROID_SDK as replacement for ANDROID_HOME

* tidy up logcat launch and refactor target device selection

* fix logcat not displaying

* filter duplicates and blanks from logcat output

extension.js

@@ -3,6 +3,7 @@
 const vscode = require('vscode');
 const { AndroidContentProvider } = require('./src/contentprovider');
 const { openLogcatWindow } = require('./src/logcat');
+const { selectAndroidProcessID } = require('./src/process-attach');
 
 // this method is called when your extension is activated
 // your extension is activated the very first time the command is executed
@@ -17,6 +18,12 @@ function activate(context) {
         vscode.commands.registerCommand('android-dev-ext.view_logcat', () => {
             openLogcatWindow(vscode);
         }),
+        // add the process picker handler - used to choose a PID to attach to
+        vscode.commands.registerCommand('PickAndroidProcess', async () => {
+            const o = await selectAndroidProcessID(vscode);
+            // the debugger requires a string value to be returned
+            return JSON.stringify(o);
+        }),
     ];
 
     context.subscriptions.splice(context.subscriptions.length, 0, ...disposables);