Major update to version 5.0

[ffraenz]

I am pleased to announce my plans for the upcoming major update 5.0 of the cryptii web app. This pull request offers a place for discussing the changes. Obviously this is work in progress and the thread will be updated accordingly. Feel free to comment your thoughts below or to create a new issue, if your feature is missing.

Major changes

• JavaScript → TypeScript
• Custom view strategy → React
• Gulp & Rollup → Webpack, introducing chunks and dynamic imports
• Horizontal pipe → Vertical pipe, on desktop and mobile (resolves Feature request: horizontal scroll bar #9)
• Dedicating more screen space to documentation
• Adding a deep link / sharing UI (resolves Implement sharing/Deep links #19)
• Adding an undo history, undo & redo UI
• Following semantic versioning going forward

Testing environment

You can review and test the changes of this branch over at dev.cryptii.com. As this is still an early commit, don't expect everything to work (e.g. adding bricks, sharing, etc.).

[ffraenz]

This was a lot of work but it won't make it into the cryptii project. Bye! See #129 for more details.