Structured styler parameters

[Aurumaker72]

Instead of dumping all styler parameters into the styler, each control should get its own category.

Old:

joystick_line_colors = {
            [1] = BreitbandGraphics.hex_to_color('#0000FF'),
            [2] = BreitbandGraphics.hex_to_color('#0000FF'),
            [3] = BreitbandGraphics.hex_to_color('#0000FF'),
            [0] = BreitbandGraphics.hex_to_color('#8080FF'),
        },
        joystick_inner_mag_colors = {
            [1] = BreitbandGraphics.hex_to_color('#FF000022'),
            [2] = BreitbandGraphics.hex_to_color('#FF000022'),
            [3] = BreitbandGraphics.hex_to_color('#FF000022'),
            [0] = BreitbandGraphics.hex_to_color('#00000000'),
        },
        joystick_outer_mag_colors = {
            [1] = BreitbandGraphics.hex_to_color('#FF0000'),
            [2] = BreitbandGraphics.hex_to_color('#FF0000'),
            [3] = BreitbandGraphics.hex_to_color('#FF0000'),
            [0] = BreitbandGraphics.hex_to_color('#FF8080'),
        },

New:

joystick = {
    line_colors = { ... },
    inner_mag_colors = { ... },
    outer_mag_colors = { ... },
}