FRAME: Consideration (abstraction over storage deposits) (#1361)

* Consideration trait

* Avoid associated type in Consideration

* Update substrate/frame/support/src/traits/tokens/fungible/freeze.rs

Co-authored-by: Francisco Aguirre <franciscoaguirreperez@gmail.com>

* Update substrate/frame/support/src/traits/tokens/fungible/freeze.rs

Co-authored-by: Francisco Aguirre <franciscoaguirreperez@gmail.com>

* Update substrate/frame/support/src/traits/storage.rs

Co-authored-by: Kian Paimani <5588131+kianenigma@users.noreply.github.com>

* Update substrate/frame/support/src/traits/tokens/fungible/mod.rs

Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* ".git/.scripts/commands/fmt/fmt.sh"

* Add

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Co-authored-by: Francisco Aguirre <franciscoaguirreperez@gmail.com>
Co-authored-by: Kian Paimani <5588131+kianenigma@users.noreply.github.com>
Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
Co-authored-by: command-bot <>