🎨 Cleanup include path for catch2

✨ Add basic .deb generation support
WiX and RPM support is still needed for verification

⬆️ Upgrade minimum CMake version to 3.14
⬆️ Upgrade Catch to Catch v2.9.2
📌 Pin Catch to v2.9.1

👷 Update .travis.yml build matrix
👷 Update .appveyor build script

✅ Update tests to be separated by file

tests/issues.cpp

@@ -1,4 +1,4 @@
-#include "catch.hpp"
+#include <catch2/catch.hpp>
 #include <tl/optional.hpp>
 #include <type_traits>
 
@@ -42,4 +42,4 @@ TEST_CASE("issue 33") {
     REQUIRE(j == 42);
     REQUIRE(*a == 42);
     REQUIRE(a.has_value());
-}
+}