Sending compactBlocks via HighBW Peers

[waridrox]

Implementation

• Changed implementation of compact blocks from compactMode property to compactModeTo and compactModeFrom.
• Created a highBW Peer List to incorporate highBW compact blocks sending peers.
• Created function setHighBWPeer that checks if the peer is inbound or outbound, effectively responding with appropriate compactBlock request. (HighBW or LowBW).
• Created function removeHighBWPeer to remove a highBW peer from the peer list.
• Added compact blocks constants - COMPACT_BLOCKS_HIGHBW and COMPACT_BLOCKS_LOWBW in common.js to change peer.sendCompact nature.

[waridrox]

Hey @pinheadmz, here's the implementation, (I also added some comments that I'll remove later). Let me know if the implementation is ok, so that I can move over to testing 😄. Thanks.