* Fix unnamed return variable warning

This commit fixes warnings thrown by the solc 0.7.4 compiler:
"Warning: Unnamed return variable can remain unassigned. Add an explicit
return with value to all non-reverting code paths or name the variable."

* Fix function state mutability warning

This commit fixes warnings thrown by the solc 0.7.4 compiler:
"Warning: Function state mutability can be restricted to pure"

* Fix shadows an existing declaration warning

This commit fixes warnings thrown by the solc 0.7.4 compiler:
"Warning: This declaration shadows an existing declaration."

1. Arguments by default are not underscored.
2. If the name isn't available due to shadowing, use prefix underscore.
3. If prefix underscore isn't available due to shadowing, use suffix underscore.

(cherry picked from commit 09d437c1)

(cherry picked from commit cfb7f800)

* Fix typos and formatting

* Add Solidity release dates: releases-stability

Co-authored-by: Renovate Bot <bot@renovateapp.com>

Co-authored-by: Paolo Dibitonto <p.dibitonto@almaviva.it>
Co-authored-by: Francisco Giordano <frangio.1@gmail.com>

* Update all non-major dependencies

* disable solhint reason-string rule

Co-authored-by: Renovate Bot <bot@renovateapp.com>
Co-authored-by: Francisco Giordano <frangio.1@gmail.com>

* chore: fix code style parameters in Event

* chore: update code style for events