FT_HANDLE finalizer fails and can interfere with D2XXDevice operation

[ReubenHill]

The FT_HANDLE finalizer sometimes still fails and seems to often interfere with operation of the D2XXDevice. An example of the finalizer failing:

julia> d = D2XXDevices(); open.(d); d = nothing; d = D2XXDevice(0); sleep(1.0); open(d)
ERROR: D2XXException("Device already open.")
Stacktrace:
 [1] open(::D2XXDevice) at C:\Users\Reuben\Documents\GitHub\LibFTD2XX\src\LibFTD2XX.jl:207
 [2] top-level scope at none:0

julia> GC.gc()
error in running finalizer: LibFTD2XX.Wrapper.FT_STATUS_ENUM(0x00000001)
error in running finalizer: LibFTD2XX.Wrapper.FT_STATUS_ENUM(0x00000001)
error in running finalizer: LibFTD2XX.Wrapper.FT_STATUS_ENUM(0x00000001)
error in running finalizer: LibFTD2XX.Wrapper.FT_STATUS_ENUM(0x00000001)

[ReubenHill]

Explicitly calling finalize(fthandle(d)) where d::D2XXDevice before d goes out of scope avoids errors but is messy.