Initial commit for displaying shortcuts in all apps list

[YoeriNijs]

An initial commit for displaying shortcuts in the all apps list (as proposed by #621). Not all functions are implemented yet, such as the tag displaying functionality (cc @Neamar ).

I don't know how translators can notice that existing values are changed. Maybe one can help me with that. @naofum, perhaps?

[nmitsou]

Hi @YoeriNijs can you explain a bit more what this pr is doing?

[ntninja]

@YoeriNijs: Updated strings are displayed as "strings needing review" in WebLate and (if you opted in) an appropriate e-mail will be dispatched. Don't worry too much about changing existing strings. 😀

[YoeriNijs]

Nice to read, @Alexander255.

Well, @nmitsou, with this PR, shortcuts will be displayed in the all apps list. Moreover, it is possible to exclude the shortcuts from KISS. As aforementioned, it is still lacking some functionalities that (other devs) might implement over time.

[Neamar]

I was only able to read the code, because sadly my phone got upgraded to Oreo which removes supports for shortcuts (thanks Android devs...) https://developer.android.com/about/versions/oreo/android-8.0-changes.html

Can anyone with an older Android version review and test?

[Neamar]

Can't be tested anymore as I don't have nougat anymore :(

I'm going to close as no one was able to test.