Keepassxc: Add the ability to change accent color

[DanyGee]

Summary

Allow selection of an accent color, so users can change the default green to color of their choice (either a full spectrum color chooser or some preinstalled few ones should do).

Examples

Color picker might look like this:

Eventually like this:

Context

The context is purely aesthetic.
User might want to match the apps accent with his desktop theme or match the colors of his company he owns or works in.
As minor as it may seem, it will still be value added 💡

[droidmonkey]

Not a bad idea, but will require a fair amount of work to get the shading and such correct.

[pkrc267]

I would like to work on it. Have basic understanding of Qt framework. Will be a good learning experience.

[droidmonkey]

Good luck!

[pkrc267]

Need a little help. I have gone through CONTRIBUTING.md, forked and cloned the repository. How can I open the project in Qt creator?

[droidmonkey]

Open the cmakelists.txt

[pkrc267]

So I have been a bit occupied with my college curriculum. But I'm back and here is a little progress that I've made.
I'm aware of a few points like position of the Color button, but that I think can be changed with some help. For now how does this look. Also please tell me what can/should be done.

_p.s. I added the gradient as it looked cool. But have to work on text color change accordingly._

Clear video: https://drive.google.com/file/d/1IdX9SJIJo0vZCIEhYLYHpYpJeqPhXbYC/view?usp=sharing

GIF:

Screenshot:

[droidmonkey]

Its an experiment, but that would never be merged in unfortunately. Keep learning, you're making progress.