Removes all dynamic_cast, in order to make it work without RTTI. This is due to golang/go#10023 (duplicate of golang/go#4069) and solves go-qml#19.

Make it work without global variable initialization. This is due to golang/go#10023 (duplicate of golang/go#4069) and solves go-qml#142.

Cleanup

Cleanup (tabs to spaces)

Added proper casting from QMetaType::User (1024) with userType 1034 (i.e.,
QJSValue) to QVariant so it can be handled properly by the packDataValue
method.

Go 1.6 cannot have Go pointer stored into the cgo space. So instead we
need to store all Go values in a map and pass a key to the cgo
space. When needed the key can be used to retrieve the go value from the
map.

Safer

Go 1.6 (final)

# Conflicts:
#	cpp/idletimer.cpp

Using the C.GoRef datatype instead of uintptr in
the go code make it more clear what the variable
contains.

added methods to the type so that we can get the GoRef and register the
fold in the lookup table, then a function to destroy the reference when
we are done with the valueFold.

Go1.6 port

When unpacking a DataValue of a DTGoAddr type, we forgot to dereference the datap pointer
that contained the GoRef.

Thanks to immesys on github, for pointing out the bug.

fix forgotten dereferenced datap pointer.