[Themes] Updated themes_manager.py and JSON themes

[ArtichOwO]

No more "alone" nor "no key" colors in JSON, and there's still retro-compatibility with older themes

[OmegaRobot]

	.text	.rodata	.bss	.data	Total (RAM)	Total (ROM)
Base	720688 bytes	400431 bytes	226872 bytes	2176 bytes	229048 bytes	1123295 bytes
Head	718512 bytes	406395 bytes	226832 bytes	2176 bytes	229008 bytes	1127083 bytes
	-2176 bytes	+5964 bytes	-40 bytes	+0 bytes	-40 bytes	+3788 bytes
	-0.3 %	+1.5 %	-0.0 %	+0.0 %	-0.0 %	+0.3 %

[OmegaRobot]

	.text	.rodata	.bss	.data	Total (RAM)	Total (ROM)
Base	720688 bytes	400431 bytes	226872 bytes	2176 bytes	229048 bytes	1123295 bytes
Head	718512 bytes	406395 bytes	226832 bytes	2176 bytes	229008 bytes	1127083 bytes
	-2176 bytes	+5964 bytes	-40 bytes	+0 bytes	-40 bytes	+3788 bytes
	-0.3 %	+1.5 %	-0.0 %	+0.0 %	-0.0 %	+0.3 %

[OmegaRobot]

	.text	.rodata	.bss	.data	Total (RAM)	Total (ROM)
Base	720688 bytes	400431 bytes	226872 bytes	2176 bytes	229048 bytes	1123295 bytes
Head	718512 bytes	406395 bytes	226832 bytes	2176 bytes	229008 bytes	1127083 bytes
	-2176 bytes	+5964 bytes	-40 bytes	+0 bytes	-40 bytes	+3788 bytes
	-0.3 %	+1.5 %	-0.0 %	+0.0 %	-0.0 %	+0.3 %

[M4xi1m3]

Doing it like this seems like putting ducktape over a giant hole. Maybe a whole rewrite of the theme engine would be needed ? But it seems to be on the @RedGl0w list...

[OmegaRobot]

	.text	.rodata	.bss	.data	Total (RAM)	Total (ROM)
Base	720688 bytes	400431 bytes	226872 bytes	2176 bytes	229048 bytes	1123295 bytes
Head	718512 bytes	406395 bytes	226832 bytes	2176 bytes	229008 bytes	1127083 bytes
	-2176 bytes	+5964 bytes	-40 bytes	+0 bytes	-40 bytes	+3788 bytes
	-0.3 %	+1.5 %	-0.0 %	+0.0 %	-0.0 %	+0.3 %

[OmegaRobot]

	.text	.rodata	.bss	.data	Total (RAM)	Total (ROM)
Base	720688 bytes	400431 bytes	226872 bytes	2176 bytes	229048 bytes	1123295 bytes
Head	718512 bytes	406395 bytes	226832 bytes	2176 bytes	229008 bytes	1127083 bytes
	-2176 bytes	+5964 bytes	-40 bytes	+0 bytes	-40 bytes	+3788 bytes
	-0.3 %	+1.5 %	-0.0 %	+0.0 %	-0.0 %	+0.3 %

[OmegaRobot]

	.text	.rodata	.bss	.data	Total (RAM)	Total (ROM)
Base	720688 bytes	400431 bytes	226872 bytes	2176 bytes	229048 bytes	1123295 bytes
Head	718512 bytes	406395 bytes	226832 bytes	2176 bytes	229008 bytes	1127083 bytes
	-2176 bytes	+5964 bytes	-40 bytes	+0 bytes	-40 bytes	+3788 bytes
	-0.3 %	+1.5 %	-0.0 %	+0.0 %	-0.0 %	+0.3 %

[OmegaRobot]

	.text	.rodata	.bss	.data	Total (RAM)	Total (ROM)
Base	722052 bytes	401713 bytes	226872 bytes	2176 bytes	229048 bytes	1125941 bytes
Head	722052 bytes	401713 bytes	226872 bytes	2176 bytes	229048 bytes	1125941 bytes
	+0 bytes	+0 bytes	+0 bytes	+0 bytes	+0 bytes	+0 bytes
	+0.0 %	+0.0 %	+0.0 %	+0.0 %	+0.0 %	+0.0 %