libsecp256k1's API changed, so update key.cpp to use it.

Libsecp256k1 now has explicit context objects, which makes it completely thread-safe.
In turn, keep an explicit context object in key.cpp, which is explicitly initialized
destroyed. This is not really pretty now, but it's more efficient than the static
initialized object in key.cpp (which made for example bitcoin-tx slow, as for most of
its calls, libsecp256k1 wasn't actually needed).

This also brings in the new blinding support in libsecp256k1. By passing in a random
seed, temporary variables during the elliptic curve computations are altered, in such
a way that if an attacker does not know the blind, observing the internal operations
leaks less information about the keys used. This was implemented by Greg Maxwell.

dash -> crown


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change dash-tx -> crown-tx

change dash-config.h

change das
h- -> crown-

change dashrpc->crownrpc

change dash_qt -> crown_qt

change dash_cli -> crown_cli

chang
e dash_tx -> crown_tx

change test_dash -> test_crown


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DRK -> CRW

Max darksend amount -> 10000


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Adjust version.h


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- refactor initialization/fix initial values
- use global `fEnableInstantX`
- rpc output: `confirmations` (i.e. total) and `bcconfirmations` (blockchain only), fixes #593 also
- throw error in UI before submiting IX if it violates max amount

- compiling errors
- output
- CBitcoinAddress usage cleanup
- refresh qt project file
- fix typo in `masternode` debug category

- typos
- remove `mnodeman.` inside `CMasternodeMan::`

- It seems these might cause clients to get stuck in rare cases, plus we sync all of this information from the network when the client loads up anyway. I think it's best to disable these features and see if the clients stop getting stuck on random reboots.

- rebased to latest v12
- masternode, mnpayments, mnbudget and keepass categories
- remove c_str in logprint(f)