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Use more error handling

See merge request !61

The system result handling will pass the string representation of the
error to the panic macro.

Replace most of the panic calls by error handling with anyhow.

See merge request !62

(Revert this commit after the event)

See merge request !59

Due to running wasm-pack from npm now, the wasm package is now in
www/pkg/ instead of just pkg/.  Reflect this in the README.

See merge request !58

 - I suspect the restore of the cache to be the root cause
 - `www/node_modules/engel-simulator-2020` is a symlink normally so that might cause the build issue (pointing it to the wrong folder)

 - without the development mode webpack
   defaults now to production mode
 - only for local dev and the dev ci run it uses development mode hence non obfuscated code

 - in order to get rid of the additional `npm run rust-web-modules` that did a `tsc` run for `svg-level-loader.ts` it needed to
   - change the `svg_loader.rs` to point to the folder where the `svg-level-loader.ts` is living
   - change the webpack config to handle `.ts` files
 - additionally the workflow is now also simplified by the help of the webpack plugin `WasmPackPlugin`
   - that takes care of `wasm-pack` and `ts` complication and listens for change
   - additionally it also listens for changes in `svg-level-loader.ts`
 - the README.md is now also reflecting this simplified workflow that only requires `cd www && npm run start`
 - pipeline also changed accordingly

No more manually adding new cheats in index.ts

See merge request engel-simulator-2020/game!56

Functional programming is simply superior.

Move clippy job dependencies into container instead of ad-hoc installation

See merge request engel-simulator-2020/game!55

Fix some more lints

See merge request engel-simulator-2020/game!54

Add a type alias for the handler closure type to make the EventHandlers
code more readable.

The create_stationary_obstacles() function does not actually return
anything so `obstacles` was of the unit type `()`.  Remove the binding
and stop inserting it as a resource which would wrongly give the
impression of the existence of an obstacles resource.

See merge request engel-simulator-2020/game!52

Only include relevant span info in the "hash"

See merge request engel-simulator-2020/game!53

Previously the "fingerprint" would include byte position information
which can change on unrelated changes to a file.

Create clippy-based code quality report

See merge request engel-simulator-2020/game!50

added get_player und set_shifts cheats.

See merge request engel-simulator-2020/game!51

Difficulty Scaling

See merge request engel-simulator-2020/game!49