Added altcoinj library as Maven dependency.
Added new Litecoin subclass of Bitcoiny,
with mainnet and testnet ElectrumX server lists.
Added litecoinNet settings variable and getter.
Added LitecoinTests.
Most tests work but testFindHtclSecret()
needs a redeemed HTLC on chain (not yet done).
Added litecoinNet to some test settings files
in resources.
Added Litecoin BuildHTLC, Refund test apps.
Added SendLTC app as Electrum-LTC seems a bit flaky?
So far managed to build HTLC P2SH, fund it and then
refund it!
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As Bitcoin and Litecoin are both subclasses of Bitcoiny,
could unify some test apps with added Bitcoin/Litecoin
switch as first arg?
Controller no longer starts up BTC support during main startup.
This does mean that BTC startup is deferred until first BTC-related
action, and that the first BTC-related action will take much longer
to complete.
Added tests to cover startup/shutdown.
This also fixes splash logo stuck on-screen and broken Controller
shutdown when using REGTEST bitcoin network AND there is no
local regtest bitcoin server running.