Refactor vCard parser so that its implementation detail would be hidden from users.

Move the current implementation or 2.1 and 3.0 to VCardParserImpl_V21 and VCardParserImpl_V30.
- From the view of users, it is strange to make vCard 3.0 inherit vCard 2.1.
- Those two specifications still have similar implementation detail, so make implementation of vCard 3.0 inherits vCard 2.1 makes sense from technical view point.

Now VCardParser_V21 and VCardParser_V30 are independent class.

Remove strict mode in vCard 3.0, since strict parsing is not necessary from the view of actual use, and needs to extra effort to support it.

Bug: 2576738
Change-Id: I1d5cb6cffffb53337faa2dd7c519e7254e12da86