Feature/custom themes

[Rdeisenroth]

This PR allows to set custom color palettes.

Default Color Profile:

Custom Profile, set with

World.getGlobalWorld().getGuiPanel().setColorProfile(
    ColorProfile.DEFAULT.toBuilder()
        .backgroundColorDark(Color.red)
        .backgroundColorLight(Color.red)
        .fieldColorDark(Color.BLUE)
        .fieldColorLight(Color.BLUE)
        .innerBorderColorLight(Color.PINK)
        .InnerBorderColorDark(Color.PINK)
        .build()
);

This PR is subject to change due to the inclusion of Lombok.

[Rdeisenroth]

Now also supports custom field color patterns:

World.setSize(7, 6);
World.setDelay(10);
World.setVisible(true);
//noinspection UnstableApiUsage
World.getGlobalWorld().getGuiPanel().setColorProfile(
    ColorProfile.DEFAULT.toBuilder()
        .customFieldColorPattern(
            (cp, p) -> (p.x + p.y) % 2 == 0 ? cp.fieldColorLight() : cp.fieldColorDark()
        )
        .build()
);

One downside to the current approch is that the gui panel needs to be visible before we change the color theme, but this works for now.