PowerShell syntax highlighting is case sensitive for operators

[mmascolino]

As defined here: https://github.com/zyedidia/micro/blob/master/runtime/syntax/PowerShell.yaml The PowerShell operators like "if", "else", "try", "catch" are defined as all lowercase in a case sensitive manner...but PowerShell isn't case sensitive for these operators. Is it possible to use a case-insensitive regex.