Holding alt while you select with the mouse only selects the objects that fall fully within the select area (default behavior is to select anything that intersects with the select area).
I was able ...
Install ImageMagick (great open source software)
Save your presentation to pdf: File > Download as... > PDF Document (.pdf)
Convert the pdf to multiple png files using ImageMagick's convert command:
The option is not explicit but you can do it.
Go to Insert -> Text box and make a box where you want your footer, with what you want in it (I suggest centering it horizontally).
Then Right-click on ...
There is a Google Slides add-on for this: Slides Toolbox.
It allows you to select multiple photos at once from Google Drive and imports them each as a new slide.
No idea who the developer is but it ...
As I understand, the emojis that the OP is talking about are UNICODE emojis.
Unfortunately, at this time the Google Slides presentation mode doesn't display them in full color, so instead ...
From what I can tell, there's not a great way to do this. But here's a decent method for getting there:
Print settings and preview
1 slide with notes
Download as PDF
Highlight all text
While Google Slides does not natively support the functionality of setting opacity on the color of the text, there is a workaround you can use which employs a similar feature which Google Suite does ...