build2-VS To-Do List

Wrapper for internal invocation and results parsing of build2 commands
Hooking up build configurations (reference)
User settings file/UI
Language features, for buildfiles, testscripts, manifests (reference)
- Syntax highlighting (example)
- Auto-completion (example)
- Error annotation
Target listing (a la Targets View in CMake Open Folder; #182)
Tests view (see #182 and VS Test Explorer)
Package manager integration (dependency visualization, surfacing of basic bpkg features)

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