New plugins: color tools

[micheus]

I've made the changes to the palette patch so everything is in the submenu, it does look much cleaner this way. I've also added a fix for accessing the menu when right clicked outside the square.

Perfect! Thanks.

I've added a preview color square in the corner, and also I've added the ability to delete individual colours by clicking on them and right clicking to delete.

Preview looks OK, but maybe it would work a little different.
When we have LMB pressed and move around looking for the nice color we want it's OK it to be shown, but after we release the button it would be good if it was hidden again. I thought this because I noticed I was unable so see the colours behind it if I want to pick one (although it keep showing then correctly based on mouse position). And, in this case, If I was clicking on that region of the panel it would be interesting the preview be shown on the opposite side (left).


Possible additions:
- Since it's fast to get many colours in the local lists it would be nice if the window would to be automatically resized (down) to accommodate and show all the colours we have chosen;
- It can depends on the mesh density, because of the performance, but thinking about to use this panel to speed up the vertex painting it would be nice we have an option to apply the preview color directly on a selection instead of just after release the LMB. Also, because in this process we are looking for a nice color to the object it can flood the color history with unnecessary colours - since by now we need to release the LMB first.

You could add a menu option which shows a checkmark in case of enabled the "direct preview" (each click will switch the option). So, if is there any selection available you can apply the preview color direct to it.
I just updated the reorganized the menu "how to" to include that.

I'm starting to like it as an independent tool.