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

src/sockets/adbsocket.js

@@ -73,10 +73,13 @@ class ADBSocket extends AndroidSocket {
     /**
      * Sends an ADB command, checks the returned status and then reads raw data from the socket
      * @param {string} command 
+     * @param {number} timeout_ms
+     * @param {boolean} [until_closed]
      */
-    async cmd_and_read_stdout(command) {
+    async cmd_and_read_stdout(command, timeout_ms, until_closed) {
         await this.cmd_and_status(command);
-        return this.read_stdout();
+        const buf = await this.read_stdout(timeout_ms, until_closed);
+        return buf.toString('latin1');
     }
 
     /**