1.11.0 Add support for ST7796S

What's Changed

• Create CMakeLists.txt by @bsideup in #207
• Update Adafruit_ST77xx.cpp by @HerbieJay in #205
• Add ST7796S support by @ladyada in #209

New Contributors

• @bsideup made their first contribution in #207
• @HerbieJay made their first contribution in #205

Full Changelog: 1.10.4...1.11.0