Add support for ADB server environment variables (#96)

* support ADB env vars for configuring the server connection

* update startADBServer to use common adb socket params

* use adbSocket config value to set adb host and port

* make sure env var values are trimmed

* pretty-print launch args and env vars

* use adb socket host for JDWP connections

* allow JDWP port to be fixed

* include the command detail in adb command failures

* configure adb socket and jdwp port parameters for attach configs

* bump version 1.3.0

package-lock.json

@@ -1,6 +1,6 @@
 {
     "name": "android-dev-ext",
-    "version": "1.2.1",
+    "version": "1.3.0",
     "lockfileVersion": 1,
     "requires": true,
     "dependencies": {