Fix reg.py to work with the registry properly

[twangboy]

The current reg.py thinks of registry keys as if they were python keys in a dictionary which is not the case. The windows registry is broken down into the following components:

Hives

This is the top level of the registry. They all begin with HKEY.

• HKEY_CLASSES_ROOT (HKCR)
• HKEY_CURRENT_USER(HKCU)
• HKEY_LOCAL MACHINE (HKLM)
• HKEY_USER (HKU)
• HKEY_CURRENT_CONFIG

Keys

Hives contain keys. These are basically the folders beneath the hives. They can contain subkeys.

Values

Values are the name/data pairs beneath the keys and subkeys.

The following example is taken from the windows startup portion of the registry:

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
"RTHDVCPL"="\"C:\\Program Files\\Realtek\\Audio\\HDA\\RtkNGUI64.exe\" -s"
"NvBackend"="\"C:\\Program Files (x86)\\NVIDIA Corporation\\Update Core\\NvBackend.exe\""
"BTMTrayAgent"="rundll32.exe \"C:\\Program Files (x86)\\Intel\\Bluetooth\\btmshellex.dll\",TrayApp"

In this example these are the values for each:
Hive: HKEY_LOCAL_MACHINE
Key and subkeys: SOFTWARE\Microsoft\Windows\CurrentVersion\Run
Value: There are 3 values: RTHDVCPL, NvBackend, and BTMTrayAgent

The way reg.py works right now it does not differentiate between values and keys. It sees everything as a value.

[twangboy]

Partially fixed with #25648
Need to add additional functionality to the execution module to be able to add and delete keys. It currently only deals with values.
reg execution module:

• Need to add ability to delete a key and all subkeys
• Need to clean up read_key, set_key, etc... to use new variable names