libctru 2.6.0

As always, recommended and supported installation for all our releases is via devkitPro pacman

What's Changed

• fix ESC[m by @WinterMute in https://github.com//pull/574
• standardise install target, remove unused version number by @WinterMute in #575
• ansi console: implement bright foreground and background codes by @WinterMute in #576
• refactor escape sequence parsing by @WinterMute in #581