[Quest API] Add Silent Saylink Methods to Perl/Lua (#4177)

# Perl
- Add `quest::silent_saylink(text)`.
- Add `quest::silent_saylink(text, link_name)`.

# Lua
- Add `eq.silent_say_link(text)`.
- Add `eq.silent_say_link(text, link_name)`.

# Notes
- Allows operators to more easily use silent saylinks without an optional silent parameter in the traditional saylink methods.
- Sets `silent` parameter default to `false` so we do not need to pass `false` when we are not using a a silent saylink.
- Changes all places that used `EQ::SayLinkEngine::GenerateQuestSaylink` to `Saylink::Create` where possible.
- Removed `questmgr` method that is no longer necessary.
- Cleaned up Lua methods to use the strings directly instead of building one out.

zone/dialogue_window.cpp

@@ -334,7 +334,7 @@ void DialogueWindow::Render(Client *c, std::string markdown)
 	if (responses.size() > 1) {
 		for (auto &r: responses) {
 			bracket_responses.emplace_back(
-				fmt::format("[{}]", Saylink::Create(r, false))
+				fmt::format("[{}]", Saylink::Create(r))
 			);
 		}
 	}