Update CSSProperties.json

Added background-blend-mode CSS property.
added .bash to bash syntax highlighting and .ino to cpp syntax highlighting
Use letters prefixes instead of numbers
Merge pull request #8146 from coliff/patch-3

Update CSSProperties.json
Merge pull request #8340 from tylucaskelley/bash-arduino-syntax

added .bash to bash highlighting and .ino to cpp highlighting
Merge pull request #8341 from adobe/tom/fix-dirs-first

Fix #8273: "sortDirectoriesFirst": true in .brackets.json not always working properly