Can't use code-runner on 'Git Bash' with 'C++/Java' because '$dir' issue!

- VS Code Version: 1.33.1
- OS Version: Windows 10 Pro
- Code Runner Version: 0.9.8

**Describe the bug**
Languages using '$dir' value in "code-runner.executorMap" is not working because the format of "$dir" value is not for Git Bash.


Refer code-runner.executorMap,

"python": "python -u",
"cpp": "cd $dir && g++ $fileName -o $fileNameWithoutExt && $dir$fileNameWithoutExt",
"java": "cd $dir && javac $fileName && java $fileNameWithoutExt",

if (your code runner runs in integrated terimal && your terminal is git bash)
{
python is working in any workspace internal folder
cpp / java is not working in any directory
}

**To Reproduce**
Steps to reproduce the behavior:

1. Change to run code in Integrated Terminal.
"code-runner.runInTerminal": true,

2. Set terminal as Git Bash
"terminal.integrated.shell.windows": "C:\\Program Files\\Git\\bin\\bash.exe"

3. Run code with any language using **"$dir"** in "code-runner.executorMap"
ex) C++, Java

You can refer below image.


**Actual behavior**


**Expected behavior**


// As #106 is closed with no answer, I wrote this for more detailed debug information.