Listen to tiled signal in deco plugin and emit view_tiled signal on core

[timgott]

Fixes timgott/wayfire-shadows#19 and partially #2043

For the decoration plugin that should be very low overhead even if the maximized criterion is not used, so why not.

But please, can all view signals be consistently emitted on view, output and core at once.

[soreau]

But please, can all view signals be consistently emitted on view, output and core at once.

👍

I've run into problems like this before, builds fine, plugin source hasn't changed but wayfire did, so it doesn't work.

[timgott]

So I had only tested with "floating is false", this fixes #2043 only partially, see there.

[ammen99]

But please, can all view signals be consistently emitted on view, output and core at once.

I see no reason not to do it, it may even make sense to have a helper function so that we always emit on all three at once. PRs welcome :)

[ammen99]

Thanks!