update initial state transitions according to [MS-RDPBCGR]
the diagram is misleading, some of the text below ambigious, but
1.3.1.1 Connection Sequence phase 10 description lists the dependencies
of server initiated messages.
* Implemented missing server side version of PDU (just skip data)
* Refactored read/write functions to properly check stream
length/capacity and handle return values.
CMake 2.8 does not support default visibility on windows.
To allow building tests add the FREERDP_LOCAL define for each
function that is internal to FreeRDP.
When build with testing these functions are exported and available
for use by tests.