Stiximport refactored 2

[davidonzo]

Main changes: The code has been refactored defining a dedicated function for the following objects:

• File objects: buildFileAttribute
• Address objects: buildAddressAttribute
• Email objects: buildEmailMessageAttribute
• Domain object: buildDomainNameAttribute
• Hostname object: buildHostnameAttribute
• URI object: buildURIAttribute

I think some function definition can be compacted in a single function, but I thing this way should be better to code management's purpose.

All objects listed below now support the "Related_Objects" import, but just for the first level.

Minor changes:

• Added support for SHA512 hash
• Added support for file_extension using the attribute type "pattern-in-file" because MISP seems to not have a specific object

Applied @FloatingGhost changes requested (I hope by the right way)

Thanks for your time in advance and for your support in code review.

[FloatingGhost]

See this - you've mixed tabs and spaces, and there are some indentation issues

[davidonzo]

Solved: 35ab32b

[FloatingGhost]

thanks <3

[davidonzo]

Thanks to you!