Language support: Add support for Batch files (.BAT)

To add Batch Support:

In package.json add 
   "onLanguage:batch", under "onLanguage:ada",

In parser.ts add:
    case "bat": this.setCommentFormat("::", "rem.||(", ")"); break;

sample batch:
```script
@echo off
cls
echo single line comments
::! alert
::TODO: something
echo multi line comments
rem.||(
  * ! alert
  * TODO something
)
:end

