Requested switchable RGBA channels with shortcut keys + include alpha channel in "swap colours"

[newtoddler]

Hello!

It would be a nice feature
1. if one could switch on/off the RGBA channels to display with shortcuts.
2. if alpha channel would be included in the "swap colours" menu.

By the way I like this very useful and great image viewer/editor! I congratulate developer on his program!

Thanks