Ensure to compile with TypeScript strict checks enabled

[danielwiehl]

In order to support a wide range of projects, the SCION Workbench should pass TypeScript's strict checks.

See https://www.typescriptlang.org/tsconfig for available strict checks.

[danielwiehl]

In the meantime, as a workaround, please disable strict type checking in your tsconfig.json as follows:

{
  "compilerOptions": {
    ...
    "strict": false
  }
}