[ALOY-728] Add a CLI command to extract i18n strings from alloy code and update the strings.xml files

Now supports searching for Ti.Locale.getString() and Titanium.Locale.getString(), not just L()

The regex for matching more closely follows the guidelines set forth for i18n keys in the wiki

Handles the situation where there's no i18n folder, or no strings.xml file

Fixed a few argument handling bugs

merge() code now merges successfully instead of overwriting the existing strings.xml file with only the new keys

I created a new option "-A, --apply" for writing the i18n files, instead of "-f, --force}}. --force feels like you're doing something wrong, --apply feels cleaner.

Calling alloy extract-i18n without --apply will show you a before and after of the target strings.xml file.

Calling alloy extract-i18n --apply will not totally overwrite the existing strings.xml file, but will instead append nodes to the end of the list. This helps preserve the file formatting previous to using alloy extract-i18n.

Underscore.js functions were used in a number of places to make the code a bit tighter.

File writes use os.EOL instead of \n so that the files print correctly on all host OSes.

Added a test app for ensuring it works as expected

Run the test app (ALOY-728)

You should see a label on the screen that says "nothing assigned yet"

After the app starts, delete the existing *i18n* folder

Run alloy extract-i18n. You should see a before and after that looks like this:

   [INFO] ######## BEFORE ########
   <?xml version="1.0" encoding="UTF-8"?><resources>
   </resources>
   [INFO] ######## AFTER  ########
   <?xml version="1.0" encoding="UTF-8"?><resources>
   <?xml version="1.0" encoding="UTF-8"?><resources>
     <string name="foo">foo</string>
     <string name="foo1good">foo1good</string>
     <string name="found_me">found_me</string>
     <string name="thekey1">thekey1</string>
     <string name="thekey2">thekey2</string>
     <string name="thekey3">thekey3</string>
     <string name="tester">tester</string>
   </resources>
   </resources>
   

Next run alloy extract-i18n --apply

Ensure that after running the above command that the *i18n/en/strings.xml* file contains the contents that you saw in the previous "after" data.

Run alloy extract-i18n --apply again. You should get a warning message telling you that there's nothing to do since the file is already up to date.

Run alloy extract-i18n --apply es.

Ensure that after running the above command that the *i18n/es/strings.xml* file contains the contents that you saw in the previous "after" data.

Go into the *i18n/en/strings.xml* and change the value for the "tester" key to "I work!"

Make sure that your testing emulator/simulator/device is set for english language

Restart the app

You should see a label that says "I work!" now