Also check for writable settings in unit test runes

Was causing unnecessary read re-requests to get sent out

- More more on making QGCView real
- Converted Parameter Editor to QGCView

- Download working again
- Fixed lots of bad error handling

writeFileAccumulator contents cleared on errors, nack or ack timeout
memcpy used to transfer data to request message buffer

Sorting source and headers while at it.

It does not update anything internally. It just moves the path on the screen.