Added some information about Qt Creator IDE integration to the wiki

[Ilmari Lauhakangas]

On 10.2.2021 18.13, Michael Weghorn wrote:
> Hi Hossein,
> 
> thanks! Could you possibly recheck whether all of the custom steps for 
> Qt Creator setup are still necessary with an up-to-date git master?
> 
> Those 3 commits from Sunday were meant to simplify the setup a bit 
> (automatically set up run + build configurations), so it'd be 
> interesting to hear whether that actually works for you as well (I just 
> tested with Qt Creator 4.14 myself):
> 
> * 
> https://git.libreoffice.org/core/+/77d5383c6e83fdcb268138f71601fa39c95a62aa%5E! 
> ("qtcreator: Don't create useless run configurations for subdirs")

Gitiles has some weird glitch and shows the wrong commit for two of 
these. Working link:

https://git.libreoffice.org/core/commit/77d5383c6e83fdcb268138f71601fa39c95a62aa

> * 
> https://git.libreoffice.org/core/+/fdd9b20572435842bde076e3c35ef94d26f13b30%5E! 
> ("qtcreator: Drop some extra whitespace in .pro.user template")
> 
> * 
> https://git.libreoffice.org/core/+/d2d6e5c235f35bf3f2137e8dab4b9b32b72430a8%5E! 
> ("qtcreator: Show actual names for build configurations")

Working link:
https://git.libreoffice.org/core/commit/d2d6e5c235f35bf3f2137e8dab4b9b32b72430a8

Ilmari