fix: xterm-256 cube uses 0xd7 not 0xdf for level-4 color (palette typo) - #30

[InconsistentCapitalization] Found the field 'Mode' with the same name as the parameter 'mode' but with different capitalization.

[InconsistentCapitalization] Found the field 'B' with the same name as the parameter 'b' but with different capitalization.

[InconsistentCapitalization] Found the field 'G' with the same name as the parameter 'g' but with different capitalization.

[InconsistentCapitalization] Found the field 'R' with the same name as the parameter 'r' but with different capitalization.

[MutablePublicArray] Non-empty arrays are mutable, so this `public static final` array is not a constant and can be modified by clients of this class. Prefer an ImmutableList, or provide an accessor method that returns a defensive copy.

[MutablePublicArray] Non-empty arrays are mutable, so this `public static final` array is not a constant and can be modified by clients of this class. Prefer an ImmutableList, or provide an accessor method that returns a defensive copy.

[MutablePublicArray] Non-empty arrays are mutable, so this `public static final` array is not a constant and can be modified by clients of this class. Prefer an ImmutableList, or provide an accessor method that returns a defensive copy.

[MutablePublicArray] Non-empty arrays are mutable, so this `public static final` array is not a constant and can be modified by clients of this class. Prefer an ImmutableList, or provide an accessor method that returns a defensive copy.

[ReferenceEquality] Comparison using reference equality instead of value equality