effects: add Meta+plus as a default shortcut for Zoom effect

Merged Nate Graham requested to merge ngraham/kwin:add-meta+plus-by-default-for-zoom into master

Right now the Zoom effect's "zoom in" action is bound by Meta+Equals, which makes sense for ANSI US keyboards without numberpads which make you hit the Shift key before you can get a plus sign, and pressing it without Shift gets you an Equals sign.

But some ANSI US keyboards have a numberpad with a Plus key, and many other keyboards without numberpads also have a Plus key, so we should allow users of those keyboards to trigger "zoom in" as easily as users of ANSI US keyboards.


Edited by Nate Graham

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