Fix cordova build error on cordova-android@7.0.0

[deton]

This pull request fixes cordova build error on cordova-android@7.0.0.

Because the project directory structure has been changed by cordova-android 7.0.0,
if platforms/android/libs/ exists,
the directory structure is not recognized as new style(*1) and an error occurs.

altbeacon.jar should be copied to platforms/android/app/libs/
instead of platforms/android/libs/.

By using <lib-file> in plugin.xml, altbeacon.jar is copied to the appropriate directory.
(on cordova-android 7.0.0 and <=6.x)

(*1)
https://github.com/apache/cordova-android/blob/a7304b9a19a7b7f760d1bba240648a35130b295a/bin/templates/cordova/lib/AndroidStudio.js

Other approach

get altbeacon library from maven repository
deton@d3488b6

Steps to reproduce the error

>cordova create foo com.example.foo foo
>cd foo
>cordova platform add android@7.0.0
>cordova plugin add cordova-plugin-ibeacon
>cordova build
cp: copyFileSync: could not write to dest file (code=ENOENT):C:\tmp\foo\platforms\android\res\xml\config.xml

Parsing C:\tmp\foo\platforms\android\res\xml\config.xml failed
(node:10160) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 1): Error: ENOENT: no such file or directory, open 'C:\tmp\foo\platforms\android\res\xml\config.xml'
(node:10160) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

Or add other plugin after cordova plugin add cordova-plugin-ibeacon.

>cordova create foo com.example.foo foo
>cd foo
>cordova platform add android@7.0.0
>cordova plugin add cordova-plugin-ibeacon
>cordova plugin add cordova-plugin-device
...
Installing "cordova-plugin-device" for android
Failed to install 'cordova-plugin-device': Error: ENOENT: no such file or directory, open 'C:\tmp\foo\platforms\android\AndroidManifest.xml'
    at Object.fs.openSync (fs.js:646:18)
    at Object.fs.readFileSync (fs.js:551:33)
    at Object.parseElementtreeSync (C:\tmp\foo\platforms\android\cordova\node_modules\cordova-common\src\util\xml-helpers.js:180:27)
    at new AndroidManifest (C:\tmp\foo\platforms\android\cordova\lib\AndroidManifest.js:29:20)
    at AndroidProject.getPackageName (C:\tmp\foo\platforms\android\cordova\lib\AndroidProject.js:99:12)
    at Api.addPlugin (C:\tmp\foo\platforms\android\cordova\Api.js:223:57)
    at handleInstall (C:\Users\deton\AppData\Roaming\npm\node_modules\cordova\node_modules\cordova-lib\src\plugman\install.js:594:10)
    at C:\Users\deton\AppData\Roaming\npm\node_modules\cordova\node_modules\cordova-lib\src\plugman\install.js:357:28
    at _fulfilled (C:\Users\deton\AppData\Roaming\npm\node_modules\cordova\node_modules\cordova-lib\node_modules\q\q.js:787:54)
    at self.promiseDispatch.done (C:\Users\deton\AppData\Roaming\npm\node_modules\cordova\node_modules\cordova-lib\node_modules\q\q.js:816:30)
(node:8416) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 1): Error: ENOENT: no such file or directory, open 'C:\tmp\foo\platforms\android\AndroidManifest.xml'
(node:8416) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

(no problem on cordova-android@6.4.0)

System info

• cordova-android 7.0.0
• cordova 8.0.0
• node.js v8.9.3
• Windows 10

[petermetz]

Thank you very much @deton