Dev to Main: Add new features and fixes (#19)

# WIMUtil v0.0.3

## What's Changed?

### Select ISO Screen
- Ability to select working directory
- Added "Start" button to begin ISO extraction process instead of it starting automatically.

### Add Answer File
- No Changes

### Add Drivers
- Drivers are being exported to "workingdirectoryroot\sources\$OEM$\$1\Drivers" and not "\workingdirectoryroot\$WinPEDriver$" which should be better and stop causing the WindowsPEPhase to work as intended.
- Note: The recommended IRST and Network drivers will be extracted to the $WinPEDriver$ folder in the future.

### Create ISO
- No changes

### Misc
- More descriptive status messages
- Defined more helper functions
- Updated CleanupAndExit function.