meta: rules wishlist

[AlbertoCentonze]

• memory overexpansion
• use @view on functions that don't modify the state
• use @pure on a function that doesn't read the state
• explicitly mark @internal functions as such
• code complexity (limit cyclomatic complexity)
• constants naming conventions
• import - initialize/use - export should be sequential
• unused imports
• unused constants
• unused functions from inline interface
• unused vars
• enforce decorator order
• naming convention for internal functions
• reminder to remove print statements
• avoid magic numbers for array bounds, array accesses
• enforce a variable containing semver being available in every module
• no cross-module variable monkeypatching
• memory variable proximity
• var scope could be stricter
• incomplete or missing natspec