Color screen edit

[shvaich]

made changes to have the new color selection screen.
also made changes to 'GuiUtil.drawVerticalLine' and 'GuiUtil.drawHorizontalLine' once I saw that they add 1px unnecessarily.
even tho it might seem logical, I think it is a mistake and should not be done.
if the changes to this methods are pushed, some other render code that uses such methods may need to be changed

[Alexdoru]

please add screeshots

[shvaich]

This is not yet the final version, some code will change.
This branch has conflicts with config_button_ui_edit branch, I should update it if and after config_button_ui_edit is merged.

The blueish border of a slider means that it is focused.

• Clicking on a slider focuses it
• If a slider is focused and you click on something else, that slider loses focus
• Pressing TAB cycles focus
• When a slider is focused, you can add/subtract 1 using ArrowLeft and ArrowRight

Undo Changes and Reset to Default buttons work the same as with RendererEditScreen.

The black background is: GuiScreen#drawDefaultBackground(). (cancelable with Patcher)

Color with no alpha (Opaque):

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Color with no alpha (Opaque) - With a focused slider:

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Color with alpha:

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Color with alpha - With a focused slider:

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I don't know if it is noticable in the "with alpha" examples I sent but the background of the Color Box in the middle of the screen is clear, it is not effected by the screen's background