Increase max number of blocked users loaded from 100 to 1,000 (#4721)

Also includes a little refactor of how the requests are made & how the blocked users are stored

src/CMakeLists.txt

@@ -385,6 +385,7 @@ set(SOURCE_FILES
 
         util/AttachToConsole.cpp
         util/AttachToConsole.hpp
+        util/CancellationToken.hpp
         util/Clipboard.cpp
         util/Clipboard.hpp
         util/ConcurrentMap.hpp