The width of the images weren't taken into consideration to calculate
the message xOffset, resulting in these messages being pushed way past
what they should be and looking very thin
Replace broken old utils.debug(...) (since the utils.js → Utils.qml
transition) with a declarative approach:
a console can now be opened with by placing a `DebugConsoleLoader {}`
anywhere.
mainUI has a default console opened by F1/alt-shit-c when no other
console is loaded.
