Factor out more rendering logic into separate renderers

[kwvanderlinde]

Identify the Bug or Feature request

Progresses #3691
Fixes #4429

Description of the Change

Rendering of lights, auras, player darkness, fog of war, vision, and debug shapes are now handled by separate renderer classes. For the most part, logic was simply copied over, but some simplifications and alterations were made.

Points of interest:

• The new RenderHelper takes care of setting up Graphics2D with initial clips and transforms. It can optionally use a temporary buffer as a render target. Each of the new renderers uses the RenderHelper.
• Fog rendering case work has been consolidated and simplified to make it a bit more direct in terms of what is happening.
• The player-specific logic for vision overlays has been eliminated. The clip set there was not used (it was always overwritten prior to use), and the logic was broken anyways due to mixing screen space and world space areas.
• The debug shape renderer shows that shapes are translucent so they don't completely occlude what is rendered behind it.

Possible Drawbacks

Should be none.

Documentation Notes

N/A

Release Notes

• More modularization of the zone renderer for fog, lights, and vision.

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This change is 

[bubblobill]

Personal preference, when defining colours, include alpha. That way it's more universally applicable and a little bit future-proofed.
From
palette = new Color[] {Color.red, Color.green, Color.blue};
to
palette = new Color[] {Color.red, Color.green, Color.blue, Color.alpha};

From
var fillColor = color.darker(); fillColor = new Color(fillColor.getRed(), fillColor.getGreen(), fillColor.getBlue(), 76);
to
var fillColor = color.darker(); fillColor = new Color(fillColor.getRed(), fillColor.getGreen(), fillColor.getBlue(), fillColor.getAlpha() / 3f );

[kwvanderlinde]

Sure, makes sense, made the change. Though I'll point out palette is just a sequence of colours to cycle through, not itself a color with an alpha.