Add subtitle to Hype Chats (#4715)

* feat: more hype chat

* Add `std::chrono::seconds` overload to formatTime

* Move & rename it to HypeChat + some other mini things

* Add changelog entry

* fix formattime test

---------

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

tests/src/FormatTime.cpp

@@ -2,7 +2,10 @@
 
 #include <gtest/gtest.h>
 
+#include <chrono>
+
 using namespace chatterino;
+using namespace std::chrono_literals;
 
 TEST(FormatTime, Int)
 {
@@ -131,3 +134,75 @@ TEST(FormatTime, QString)
             << ") did not match expected value " << qUtf8Printable(expected);
     }
 }
+
+TEST(FormatTime, chrono)
+{
+    struct TestCase {
+        std::chrono::seconds input;
+        QString expectedOutput;
+    };
+
+    std::vector<TestCase> tests{
+        {
+            0s,
+            "",
+        },
+        {
+            1337s,
+            "22m 17s",
+        },
+        {
+            {22min + 17s},
+            "22m 17s",
+        },
+        {
+            623452s,
+            "7d 5h 10m 52s",
+        },
+        {
+            8345s,
+            "2h 19m 5s",
+        },
+        {
+            314034s,
+            "3d 15h 13m 54s",
+        },
+        {
+            27s,
+            "27s",
+        },
+        {
+            34589s,
+            "9h 36m 29s",
+        },
+        {
+            9h + 36min + 29s,
+            "9h 36m 29s",
+        },
+        {
+            3659s,
+            "1h 59s",
+        },
+        {
+            1h + 59s,
+            "1h 59s",
+        },
+        {
+            1045345s,
+            "12d 2h 22m 25s",
+        },
+        {
+            86432s,
+            "1d 32s",
+        },
+    };
+
+    for (const auto &[input, expected] : tests)
+    {
+        const auto actual = formatTime(input);
+
+        EXPECT_EQ(actual, expected)
+            << qUtf8Printable(actual) << " did not match expected value "
+            << qUtf8Printable(expected);
+    }
+}