Fixing issues when color picker freezes

[martinchrzan]

Summary of the Pull Request

Color picker can freeze when you pick a color because we are trying to access clipboard using Clipboard.SetText - but this method might as some other applications can hold clipboard.
Switching to use Clipboard.SetDataObject I couldn't reproduce this issue anymore

This also fixes another issue when user holds activations keys while picking - this was causing that show picker was called many times and in the end it resulted in a nasty bug where we called copy into clipboard and into the editor nonstop. Can be seen here - https://youtu.be/6mzs90-KlMg?t=195
Described also here #6594

PR Checklist

• Applies to Color Picker hangs while holding activation keystroke #6594
• CLA signed. If not, go over here and sign the CLA
• Tests added/passed
• Requires documentation to be updated
• I've discussed this with core contributors already. If not checked, I'm ready to accept this work might be rejected in favor of a different grand plan. Issue number where discussion took place: #xxx

Info on Pull Request

Validation Steps Performed

Unless you use some special tools for clipboard, it is hard to reproduce as it can happen randomly, but to get a stable reproduction, install Clipjump tool with this running this issue is reproducible all the time and it basically simulate the same issue that can happen randomly with some other application. With the fix, this issue does not appear anymore.

The other issue can be easily reproduced by holding activation keys while picking a color.

[mnower]

crutkas: removed

[mnower]

crutkas: removed