Delete method.{cc,h}
Rename $ccls/setSkippedRanges to $ccls/publishSkippedRanges
Rename $ccls/publishSemanticHighlighting to $ccls/publishSemanticHighlight; stableId -> id
Before, QueryFile::Def::{all_symbols,outline} were built by indexers.
Now, {symbol,outline}2refcnt are used instead, built by main thread.
*_removed are augmented with Query*:Def to allow removal of old {symbol,outline}2refcnt entries.