Improve debug.sh script
Improve debug.sh script

- Move to the `bin` directly so that SOS works properly.
- Check for LLDB and PowerShell programs.
- Display help text.

kmosher/PowerShell,TravisEz13/PowerShell,kmosher/PowerShell,TravisEz13/PowerShell,daxian-dbw/PowerShell,bmanikm/PowerShell,jsoref/PowerShell,jsoref/PowerShell,TravisEz13/PowerShell,PaulHigin/PowerShell,KarolKaczmarek/PowerShell,daxian-dbw/PowerShell,bingbing8/PowerShell,bingbing8/PowerShell,KarolKaczmarek/PowerShell,bingbing8/PowerShell,jsoref/PowerShell,JamesWTruher/PowerShell-1,bmanikm/PowerShell,bmanikm/PowerShell,bmanikm/PowerShell,daxian-dbw/PowerShell,JamesWTruher/PowerShell-1,jsoref/PowerShell,daxian-dbw/PowerShell,bingbing8/PowerShell,PaulHigin/PowerShell,bmanikm/PowerShell,kmosher/PowerShell,kmosher/PowerShell,bingbing8/PowerShell,KarolKaczmarek/PowerShell,KarolKaczmarek/PowerShell,kmosher/PowerShell,jsoref/PowerShell,JamesWTruher/PowerShell-1,KarolKaczmarek/PowerShell,TravisEz13/PowerShell,JamesWTruher/PowerShell-1,PaulHigin/PowerShell,PaulHigin/PowerShell