We don't need to add any importing scopes for a snippet if it doesn't
contain import directives. This fix optimizes performance by reducing
importing scopes count.
nameFilter - way of filtering descriptors by their names;
filterOutShadowedDescriptors - if true, filters out descriptors
shadowed by descriptors in latter-compiled snippets. May slow down
completion performance.
it conflicts with the compilation on daemon, so transistion should
be planned accordingly, and now it is not a good time for it.
The most important part of the renaming remains intact.
Partially reverts commit "Rename scripting libs and plugin - invert embeddable suffix"
now regular, unshaded libs, are named with suffix `-unshaded`, while
former `-embeddable` ones named without any suffix. This will encoursge
use of the shaded libs by default, avoiding conflicts with 3-party
libs packed into the `kotlin-compiler`.
Note, that only the "frontline" libs are renamed to avoid switching
problems, the ones that not normally used directly are left as is,
including the `kotlin-compiler` itself.
Final expressions here are literals, "closed" function calls,
expressions in brackets. Completion variants should not appear after
them if they are not followed by by dot (.) or double colon (::).
Note that identifiers are not considered as final expressions.
