List of issues, solving each of them can simplify usage of library

[xgreenx]

• Implement new trait definition codegen 🚀  use-ink/ink#665 - Improved the trait_definition macro. Now it supports ink! attributes and they can't be overwritten. Introduced a new API to do cross-contract calls.
• Shared external event definitions use-ink/ink#809 - allows define events outside of contract implementation and also will help to resolve Event's identifiers are based on the naming of the storage structure #2
• Add ability to evaluate selector during generation of contract from selector's name use-ink/ink#806 - will simplify cross calling and selector evaluation
• Support modifiers defined by user use-ink/ink#807 - will introduce modifiers to ink!
• Add additional methods to wrapper around the account of contract use-ink/ink#808 - will simplify the call of another contract in cases when failed call also is a good scenario.

[Robbepop]

First and third points are done by now.

[xgreenx]

First and third points are done by now.

Thank you for your notificaiton=) Regarding: use-ink/ink#665. Initially, this PR was created for the feature dyn Erc20 and Box<dyn Erc20>. But you decided to move it to separate PR. Do you plan to create an issue for that?

[Robbepop]

use-ink/ink#665 created the foundations required to implement dynamic dispatch-like functionality to ink!, e.g. your mentioned dyn Erc20. However, we currently have different priorities so this particular feature that is very design and work intense was moved back. Still we plan on implementing it in future ink! releases.