Improve content assist processor to provide better/more relevant suggestions Use cases for proposing: - [x] module names after "import from" - [x] module names after "friend module" - [x] component types where they are relevant, e.g. after "runs on", "system" - [x] matching/compatible type variables/constants/functions etc. from the visible scope for the right side of an assignment - [x] matching/compatible type variables/constants/functions etc. from the visible scope for function parameter - [x] the enumerated items of the matching type for the right side of an assignment - [x] tags in doc comment section Generic tasks: - [x] handle performance issues if a very long list of proposals is generated