Fix: Palettes must be defined in a specific order, not sorted by filename.

[PeterN]

Motivation

Old versions of grfcodec has the palettes defined in a specific order.

This got lost (probably with the move to CMake), and the palettes are sorted in the CMakeLists.txt by filename alphabetically.

Built-in palettes: use -p <number>, where <number> is one of the following:
	4  DOS TTD
	6  Windows TTD
	3  DOS TTD, Candyland
	5  Windows TTD, Candyland
	2  TT Original
	1  TT Original, Mars landscape

Description

Adjust CMakeLists.txt to get back to the intended order.

Built-in palettes: use -p <number>, where <number> is one of the following:
	1  DOS TTD
	2  Windows TTD
	3  DOS TTD, Candyland
	4  Windows TTD, Candyland
	5  TT Original
	6  TT Original, Mars landscape

[PeterN]

I know #24 attempts to resolve this too, but I don't think that is correct. Any scripts using grfcodec would expect to use -p 1 or -p 2 normally.

[glx22]

Yup the order changed with 8ed61cf