Refactor VCard-related code.

Move VCard code from android/syncml/pim to android/pim since the code is not
related to SyncML at all; Previous code was misplaced, I suppose.

Reorganize "Builder" structure:
Create VCardBuilderBase.java as a base class for "Builder" classes.

Separate VCardDataBuilder to several components.
Now, VCardBuilder is able to accept EntryHandlers (interface) which handle each VCard entry.
Add EntriCommitter and ProgressShower as ones of EntryHandler implementations.

Stop using VNode/PropertyNode in the actual importing path. Instead, VCard importer directly
creates ContactStruct object.

PropertyNode is still used in test codes, since it does not drop any kind of information
while ContactStruct does.

All codes are made hidden (with package.html) like the files in syncml directory;
These files are only for Contacts app.

Issue
- due to internal issue 1975498, any performance test cannot be conducted.

Next todos
- Add tests for ContactStruct.
- remove android/syncml directory.
- Rename several methods; old names are based on V??? structure, which does not make sense in the current code.
- Use ContentProviderOperation instead of relying on beginTransaction()/endTransaction().
- Use ContactsContact in Eclair

Related internal issues
- 1784580, 1728351

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