Improve content assist - phase 1

Improve content assist processor to provide better/more relevant suggestions

Use cases for proposing:

module names after "import from"
module names after "friend module"
component types where they are relevant, e.g. after "runs on", "system"
matching/compatible type variables/constants/functions etc. from the visible scope for the right side of an assignment
matching/compatible type variables/constants/functions etc. from the visible scope for function parameter
the enumerated items of the matching type for the right side of an assignment
tags in doc comment section

Generic tasks:

Edited Apr 28, 2022 by Adam Knapp