Add function to list physical devices

[axsaucedo]

Fixes #185

Adds:

• Retrieving physical devices
• Having access to the devices properties
• Python returns dictionary with relevant high level properties
• Added tests in cpp and python
• Fixes issue with CMakelists install interface
• Updates auto to explicit types

In separate PR:

• Allow for listing of devices without creating manager (as static function)
• This will require separating instance creation to static function (and debugCallback)
• Generally having the functions creation vk:: resources as static would be beneficial