Add CTRL+A shortcut

[winkies]

Fixes #2155

Description of the Change
Define shortcut on accelerator table and bind it with event table.

Alternate Designs
Tested only on Linux environment. It should work as well on Windows but it should be tested on MacOS X.

Release Notes
Add CTRL+A shortcut for advance view of boinc manager.

[RichardHaselgrove]

Tested on Windows: it does work on the Tasks tab, which is where it will be most useful for me (see #3778).

I rarely need to operate on all tasks across all projects, but I might need to operate on all tasks from a single project. It would be helpful to have a command button "Show [tasks from] only this project", analogous to the button at the foot of the Event Log window - the two controls would work well together.

[AenBleidd]

@RichardHaselgrove, sound like a new feature request ;)

[winkies]

@RichardHaselgrove Glad it's useful :)

I see what you need : it doesn't seem to be too much difficult.
If maintainer (@AenBleidd ) approves your feature request, I could implement it in another one pull request ;)

[RichardHaselgrove]

The test for me of how useful a feature is: how many machines do I install in on, on the first day of testing.

Three hosts so far, monitoring eight clients between them!

So, yes, I propose "Show [tasks from] only this project" as a feature request, and I look forward to testing the resulting PR!

[RichardHaselgrove]

@winkies: not wanting to overwhelm you, but if you're comfortable working with the keyboard handler in wxWidgets, may I draw your attention to my #3359 - that one might be up your street too.