changed datatyped to UA_<datatype>
tools folder compiles...
Merge branch 'master' of https://github.com/acplt/open62541

Conflicts:
	src/opcua_binaryEncDec.c
	src/opcua_binaryEncDec.h
	src/opcua_builtInDatatypes.h
	src/opcua_connectionHelper.h
	src/opcua_secureChannelLayer.c
	src/opcua_transportLayer.c
	tests/check_stack.c
Merge branch 'master' of https://github.com/acplt/open62541

Conflicts:
	tool/opcua_basictypes.c
more changes to datatypes (datatype -> UA_datatype)
Merge branch 'master' of https://github.com/acplt/open62541

Conflicts:
	tests/check_stack.c
return UA_Int32 instead of Int32 (changed in python script)