wrap all library code into namespace if VCMI_LIB_NAMESPACE is defined

preparation for having client and server in a single process

lib/CGeneralTextHandler.cpp

@@ -19,6 +19,8 @@
 #include "VCMI_Lib.h"
 #include "Terrain.h"
 
+VCMI_LIB_NAMESPACE_BEGIN
+
 size_t Unicode::getCharacterSize(char firstByte)
 {
 	// length of utf-8 character can be determined from 1st byte by counting number of highest bits set to 1:
@@ -519,3 +521,5 @@ int32_t CGeneralTextHandler::pluralText(const int32_t textIndex, const int32_t c
 	else
 		return textIndex + 1;
 }
+
+VCMI_LIB_NAMESPACE_END