More curl fixes and changes.

* Moved LegacyPolledResponder::mCode to ResponderBase::mCode.
* Added a parameter to ResponderBase::finished (and pubError*) to set mCode.
* Renamed ResponderBase::decode_body to decode_llsd_body and added ResponderBase::decode_raw_body.
* Use LegacyPolledResponder::finished instead of LegacyPolledResponder::completed_headers
  to set remaining cached values.
* Fixed assertion in case of -DCWDEBUG and upload finish detection failure in case of HEAD
  method (mDebugIsGetMethod -> mDebugIsHeadOrGetMethod).
* Add XmlTreeInjector : support for LLXmlTree.
* Split BlockingResponder into BlockingLLSDResponder and BlockingRawResponder.
* Final blocking responders are now: BlockingLLSDPostResponder, BlockingLLSDGetResponder
  and BlockingRawGetResponder.
* Added LLHTTPClient::blockingGetRaw
* Got rid of hipporestrequest.* -- and fixed hippogridmanager.cpp to use
  LLHTTPClient::blockingGetRaw instead, and fixed llviewermessage.cpp to use
  AICurlInterface::ResponderWithCompleted and decode_raw_body instead of
  HippoRestHandlerRaw and LLHTTPClient::get4 instead of HippoRestRequest::get5.

indra/llmessage/CMakeLists.txt

@@ -8,6 +8,7 @@ include(AIStateMachine)
 include(LLMath)
 include(LLMessage)
 include(LLVFS)
+include(LLXML)
 
 include_directories (${CMAKE_CURRENT_SOURCE_DIR})
 
@@ -17,6 +18,7 @@ include_directories(
     ${LLMATH_INCLUDE_DIRS}
     ${LLMESSAGE_INCLUDE_DIRS}
     ${LLVFS_INCLUDE_DIRS}
+    ${LLXML_INCLUDE_DIRS}
     )
 
 set(llmessage_SOURCE_FILES
@@ -244,7 +246,8 @@ if (LL_TESTS)
     ${LLVFS_LIBRARIES}
     ${LLMATH_LIBRARIES}
     ${LLCOMMON_LIBRARIES}
-      ${GOOGLEMOCK_LIBRARIES}
+    ${GOOGLEMOCK_LIBRARIES}
+    ${LLXML_LIBRARIES}
     )
 
   LL_ADD_INTEGRATION_TEST(