explicit use of std::vector instead of buffer/Buffer

There were several scoped 'using buffer = std::vector<uint8_t>;' in
header files. This consolidates the code base to use
std::vector<uint8_t> instead of buffer or Buffer. This makes the code
easier to read and debug.

Change-Id: I918a0f6ca9b8e4b9d331175dccff45cbf4c8379d
Signed-off-by: Vernon Mauery <vernon.mauery@linux.intel.com>
diff --git a/message_handler.cpp b/message_handler.cpp
index e66e39c..beeb798 100644
--- a/message_handler.cpp
+++ b/message_handler.cpp
@@ -187,7 +187,7 @@
     session->channelPtr = channel;
 }
 
-void Handler::sendSOLPayload(const sol::Buffer& input)
+void Handler::sendSOLPayload(const std::vector<uint8_t>& input)
 {
     Message outMessage;