Updated palette and QML Controls per ui discussion

Qt 5.4 Upgrade

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

Also fix problem with incorrect symbolic link to plugins

Switched to new. I’ve seen this before with other Qt classes and have
had to change the usage in the same way.

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.