enable accelerators to work again

From the recent commit, it was reported that accelerators didnt work.

So, I've readded this through the compatibility API

Note - for some reason the accelerator does not display in the menu itself in RB2.99 - it does in RB2.96-2.98.  Dont know why.

I've renamed the compatibility module since it conflicted with my plugin.

ALT+R conflicted with the "Run"  dialog in several desktop environments such as LXDE.

I've changed the shortcut to ALT+Z.  Maybe it should be something like CTRL+SHIFT+something.  I'll leave this for you to decide.