feat(highlight): support multiple themes

Signed-off-by: Prajwal S N <[email protected]>

fix #916 autofix CLI, add integration test for it (#917)

include resolved autofixes in `--report` output (#915)

add IDE integration tests

Only call Win32 API to enable colored output once

upgrade libdparse to 0.23.2 fix mixin-type VarDecl

fix selective imports

Add dub.selections.json, upgrade libdparse 0.22.0

Note: currently a warning is emitted when building, because dscanner now
depends on libdparse 0.22.0, but dsymbol doesn't support it officially
yet. We just force it with dub.selections.json to build with 0.22.0 for
executable builds.

upgrade libdparse and DCD dependencies

Update GDC to fix CI