fix: Fixed some compiler warnings (#5028)

* fix(C4101): unreferenced local variable

* fix(C4189): variable initialized but not referenced

* fix(C4305): narrowing from double to float

* fix(C4457): declaration hiding function parameter

* fix(C4456): shadowing declaration

* fix(C4996): remove deprecations

* chore: add changelog entry

* fix: Remove more unused variables

* fix: removed unused lambda captures

* Update changelog entry

---------

Co-authored-by: Rasmus Karlsson <rasmus.karlsson@pajlada.com>

src/controllers/commands/builtin/twitch/Shoutout.cpp

@@ -47,7 +47,7 @@ QString sendShoutout(const CommandContext &ctx)
 
     getHelix()->getUserByName(
         target,
-        [twitchChannel, channel, currentUser, &target](const auto targetUser) {
+        [twitchChannel, channel, currentUser](const auto targetUser) {
             getHelix()->sendShoutout(
                 twitchChannel->roomId(), targetUser.id,
                 currentUser->getUserId(),