Upgrade to Qt6 and code clean ups

[NETSphereSoft]

Done with Qt6 Community.

Solves Issue: #39

[fabiobento512]

Hello @NETSphereSoft,

Thanks for your PR. Unfortunately I have been very busy in life and FRequest has not been a priority. I don't know when I will resume the work on this project, I even have been considering setting the repository as read only.

I would recommend that if you need these changes that you are submitting, that you fork the project and continue from there, as I can't promise anything right now.

Thanks.

[NETSphereSoft]

Hello @fabiobento512,

I'm not so familiar with C++ and also Qt6, so won't really continue on this. For my use I was needing this command line add and had to upgrade to Qt6 as Qt5 was nowhere available to install. But may be I will convert the project for Windows in .NET with C# and Microsoft Framework.NET so I could setup on your idea and add several more ideas I have with this:

• Support of different authentication modes (incl. OAuth, Bearer)
• Kind of scripting may be
• Add of additional tab for Query values
• Add of tab for form values when using related request content type
• Add of multiparted requests
• Add of mapping response value to new chained request value
• Add of open/all request methods, like for WebDAV (CalDav/CardDAV)
• Support of UDP requests like for VoIP
• Little server functionality to view applications request content

Regards

Holger