New BSIP: Multi Levels Proxy Followers Should Follow Main Proxy Vote and Change Vote

This is what happening now (Credit to Digital (Cipher) Lucifer ):
Proxy works only one level.

Person A gives Person B Proxy.
Person B gives Person C proxy.

Person A Voting Weight only affects Person B, not Person C.
Person B RAW BTS amount/default weight is amount of proxy being given to Person C.

Why this matter because normal users does not know proxy only work for 1 level, even some top proxies:
1. bitshareseurope (Followers has 54M Voting Weight, Set Bitcrab as Proxy, but when Bitcrab cast a vote, bitshareseurope only contribute 98K Voting Weight (his own account) and his followers 54M Voting Weight equal to Zero)

2. blockchain-bv (Followers has 11M Voting Weight, Set Xeroc as Proxy)

3. hellobts (Followers has 6M Voting Weight, Set Seer as Proxy)

Propose Solution: When main proxy such as Xeroc cast a vote or change vote, all his direct and indirect followers at different level should follow as well.

Related Discussion:
https://github.com/bitshares/bitshares-core/issues/968