Repaired overwriting current files for flight data log (fix #1241)

changed criticalMessageBoxOnMainThread(const QString& title, const QString& msg) to QGCMessageBox::warning

Adding TCP to the Link Configuration Manager

Remove disconnect/re-connect on too many link errors

I understand the intent when this was first created but nobody is using it and it no longer fits the context. If and when a need to abstract the serial link comes back, we can revisit this.

Modify UI to fit latest designer sketches

Message Handler

Resize setup view to fill space available

Use more normal double include ifdef

Coding style examples

Removed "Clear Text" context menu from roll down dialog
Fixed "Clear Text" context menu in Info Dialog (renamed to "Clear Messages" in the process)

Also converted qDebug statements to logging category

Shrunk the Message drop down dialog a bit.
Made the Message drop down dialog slightly transparent.

Remove '../' from includes

Replace QMessageBox::warning by QGCApplication::criticalMessageBoxOnMainThread and removed unnecessary copying action

Added to ". Please provide a different file name to save to." to the error dialog

changed QGCApplication::saveTempFlightDataLogOnMainThread(QString tempLogfile) to enable overwriting files
existing file is removed before saving file (QFile::copy cannot overwrite files)

Reworking the layout of the "Return Home" Safety Dialog.

Repaired feature to save images from video downlink (fixes #1239)

Convert Firmware Upgrade to QML

Link Configuration Management

problem:
in src/ui$/HUD.cc copyImage(UASInterface* u): u->getImage() was called twice. The first called already erased the buffer.

changes:
src/ui/HUD.cc: copyImage(UASInterface* u): instead of getting the image a second time, we take the one we already fetched

I noticed that some times, the disconnect signal would get to the updateConnect button (tool bar) before the link was physically disconnected. That would cause it to count it as a still connected link and get the connect button logic out of sync.
While at it, added an interface to the UDP link to return its configuration instance. That allows the LinkManager to unlink it when disconnecting it.

This came through google groups and as the change is right where I'd been working, I added it here to avoid collision.

Fix Eigen includes

The goal of this first installment is to organize the code a bit so it's more readable,
clean up a bit of left over cruft, and manage link configurations (and links in general).