Convert mainWindow slots to QML

[jgiszczak]

Remove manually written boilerplate code in favor of machine-generated boilerplate code.

[textbrowser]

Many changes. :) Did you test them?

[jgiszczak]

Many changes but all of a kind. I tested most of them, including all menu and toolbar actions, but do please inspect the diff carefully to be sure I didn't misspell any slot names. The one downside of this method is the late binding it does which lacks compiler checks of method names. I caught one misspelling during testing. I'm fairly sure there are no more, but a second look is advisable.

[textbrowser]

Many changes but all of a kind. I tested most of them, including all menu and toolbar actions, but do please inspect the diff carefully to be sure I didn't misspell any slot names. The one downside of this method is the late binding it does which lacks compiler checks of method names. I caught one misspelling during testing. I'm fairly sure there are no more, but a second look is advisable.

Was the misspelling which you discovered a misspelling of the conversion or of existing source?

[jgiszczak]

It was my error during conversion.

Having three variants in the slot naming scheme made things a little more difficult...

[textbrowser]

Please connect() according to https://wiki.qt.io/New_Signal_Slot_Syntax. The new method will capture errors during compilation.

However, in Qt 5.5.1, this is not necessarily simple with parameterized methods. For those, the traditional connect() will suffice.