move wallet info stuff to "getwalletinfo" rpc (left original wallet
stuff in getinfo call for backwards compatibility)

add wallet transaction count to getwalletinfo rpc call
Remove unused includes of boost lexical_cast

We don't use lexical_cast anywhere, no need to include it.
Merge pull request #3815

5283410 Remove unused includes of boost lexical_cast (Wladimir J. van der Laan)
qt: Remove control characters from ko_KR translation

Last Transifex pull (064a690) introduced a few control characters
into the Korean translation, which sometimes causes the build to fail.

Manually remove these characters for now to get the build working --
they should still be removed at Transifex too.
Merge pull request #3717 from djpnewton/wallet-txcount

add getwalletinfo RPC call with wallet transaction count