scripted-diff: Small locking rename

Call sync.h primitives "locks" and "mutexes" instead of "blocks" and "waitable
critical sections" to match current coding conventions and c++11 standard
names.

This PR does not rename the "CCriticalSection" class (though this could be done
as a followup) because it is used everywhere and would swamp the other changes
in this PR. Plain mutexes should mostly be preferred instead of recursive
mutexes in new code anyway.

-BEGIN VERIFY SCRIPT-
set -x
set -e
ren() { git grep -l $1 | xargs sed -i s/$1/$2/; }
ren CCriticalBlock           UniqueLock
ren CWaitableCriticalSection Mutex
ren CConditionVariable       std::condition_variable
ren cs_GenesisWait           g_genesis_wait_mutex
ren condvar_GenesisWait      g_genesis_wait_cv
perl -0777 -pi -e 's/.*typedef.*condition_variable.*\n\n?//g' src/sync.h
-END VERIFY SCRIPT-

src/init.cpp

@@ -561,17 +561,17 @@ static void BlockNotifyCallback(bool initialSync, const CBlockIndex *pBlockIndex
 }
 
 static bool fHaveGenesis = false;
-static CWaitableCriticalSection cs_GenesisWait;
-static CConditionVariable condvar_GenesisWait;
+static Mutex g_genesis_wait_mutex;
+static std::condition_variable g_genesis_wait_cv;
 
 static void BlockNotifyGenesisWait(bool, const CBlockIndex *pBlockIndex)
 {
     if (pBlockIndex != nullptr) {
         {
-            LOCK(cs_GenesisWait);
+            LOCK(g_genesis_wait_mutex);
             fHaveGenesis = true;
         }
-        condvar_GenesisWait.notify_all();
+        g_genesis_wait_cv.notify_all();
     }
 }
 
@@ -1661,12 +1661,12 @@ bool AppInitMain()
 
     // Wait for genesis block to be processed
     {
-        WAIT_LOCK(cs_GenesisWait, lock);
+        WAIT_LOCK(g_genesis_wait_mutex, lock);
         // We previously could hang here if StartShutdown() is called prior to
         // ThreadImport getting started, so instead we just wait on a timer to
         // check ShutdownRequested() regularly.
         while (!fHaveGenesis && !ShutdownRequested()) {
-            condvar_GenesisWait.wait_for(lock, std::chrono::milliseconds(500));
+            g_genesis_wait_cv.wait_for(lock, std::chrono::milliseconds(500));
         }
         uiInterface.NotifyBlockTip_disconnect(BlockNotifyGenesisWait);
     }