[Qt] RPC-Console: support nested commands and simple value queries

Commands can be executed with bracket syntax, example: `getwalletinfo()`.
Commands can be nested, example: `sendtoaddress(getnewaddress(), 10)`.
Simple queries are possible: `listunspent()[0][txid]`
Object values are accessed with a non-quoted string, example: [txid].

Fully backward compatible.
`generate 101` is identical to `generate(101)`
Result value queries indicated with `[]` require the new brackets syntax.
Comma as argument separator is now also possible: `sendtoaddress,<address>,<amount>`
Space as argument separator works also with the bracket syntax, example: `sendtoaddress(getnewaddress() 10)

No dept limitation, complex commands are possible:
`decoderawtransaction(getrawtransaction(getblock(getbestblockhash())[tx][0]))[vout][0][value]`

src/qt/test/test_main.cpp

@@ -1,4 +1,4 @@
-// Copyright (c) 2009-2015 The Bitcoin Core developers
+// Copyright (c) 2009-2016 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
@@ -6,6 +6,9 @@
 #include "config/bitcoin-config.h"
 #endif
 
+#include "chainparams.h"
+#include "key.h"
+#include "rpcnestedtests.h"
 #include "util.h"
 #include "uritests.h"
 
@@ -27,10 +30,17 @@ Q_IMPORT_PLUGIN(qtwcodecs)
 Q_IMPORT_PLUGIN(qkrcodecs)
 #endif
 
+extern void noui_connect();
+
 // This is all you need to run all the tests
 int main(int argc, char *argv[])
 {
+    ECC_Start();
     SetupEnvironment();
+    SetupNetworking();
+    SelectParams(CBaseChainParams::MAIN);
+    noui_connect();
+
     bool fInvalid = false;
 
     // Don't remove this, it's needed to access
@@ -48,6 +58,10 @@ int main(int argc, char *argv[])
     if (QTest::qExec(&test2) != 0)
         fInvalid = true;
 #endif
+    RPCNestedTests test3;
+    if (QTest::qExec(&test3) != 0)
+        fInvalid = true;
 
+    ECC_Stop();
     return fInvalid;
 }