feat/ipfs refactor

[altergui]

• ipfs: add EnableLocalDiscovery option
• ipfs: refactor removing very old clutter and abstractions

[altergui]

our current way of initializing IPFS is absolutely convoluted, so i'm working towards a simplification (WIP)

right now, this is a code snippet used by census3 for example

	ipfsConfig := storagelayer.IPFSNewConfig(dataDir)
	storage, err := storagelayer.Init(storagelayer.IPFS, ipfsConfig)
	if err != nil {
		return nil, ErrInitializingIPFS
	}
	var ipfsConn *ipfsconnect.IPFSConnect
	if len(groupKey) > 0 {
		ipfsConn = ipfsconnect.New(groupKey, storage.(*ipfs.Handler))
		ipfsConn.Start()
	}

which doesn't look terrible, but: passing a new option (besides dataDir) is almost impossible

i believe it would make much more sense to end up with something like this:

	storage, err := storagelayer.NewIPFS(config.IPFSCfg{
		ConfigPath: dataDir,
		ConnectKey: groupKey,
	})
	if err != nil {
		return nil, ErrInitializingIPFS
	}

that would also allow me to add options through IPFSCfg, much more easily

[altergui]

here's more progress but still there's a lot of duplication that i want to remove
in some way, i'm rounding up the refactor done 6 months ago in af85c05

[coveralls]

Pull Request Test Coverage Report for Build 6863543637

• 42 of 45 (93.33%) changed or added relevant lines in 7 files are covered.
• 4 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+0.1%) to 61.774%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
service/ipfs.go	8	9	88.89%
data/ipfs/init.go	18	20	90.0%

Files with Coverage Reduction	New Missed Lines	%
data/ipfs/ipfs.go	2	53.18%
vochain/indexer/archive.go	2	76.7%

Totals
Change from base Build 6851529453:	0.1%
Covered Lines:	14625
Relevant Lines:	23675

---

💛 - Coveralls