🎨 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/assignment.cpp

@@ -1,4 +1,4 @@
-#include "catch.hpp"
+#include <catch2/catch.hpp>
 #include <tl/optional.hpp>
 
 TEST_CASE("Assignment value", "[assignment.value]") {

tests/bases.cpp

@@ -1,4 +1,4 @@
-#include "catch.hpp"
+#include <catch2/catch.hpp>
 #include <tl/optional.hpp>
 
 // Old versions of GCC don't have the correct trait names. Could fix them up if needs be.

tests/constexpr.cpp

@@ -1,4 +1,4 @@
-#include "catch.hpp"
+#include <catch2/catch.hpp>
 #include <tl/optional.hpp>
 
 #define TOKENPASTE(x, y) x##y

tests/constructors.cpp

@@ -1,4 +1,4 @@
-#include "catch.hpp"
+#include <catch2/catch.hpp>
 #include <tl/optional.hpp>
 #include <vector>
 

tests/emplace.cpp

@@ -1,4 +1,4 @@
-#include "catch.hpp"
+#include <catch2/catch.hpp>
 #include <tl/optional.hpp>
 #include <utility>
 #include <tuple>

tests/extensions.cpp

@@ -1,4 +1,4 @@
-#include "catch.hpp"
+#include <catch2/catch.hpp>
 #include <tl/optional.hpp>
 #include <string>
 

tests/hash.cpp

@@ -1,4 +1,4 @@
-#include "catch.hpp"
+#include <catch2/catch.hpp>
 #include <tl/optional.hpp>
 
 TEST_CASE("Hashing", "[hash]") {}

tests/in_place.cpp

@@ -1,4 +1,4 @@
-#include "catch.hpp"
+#include <catch2/catch.hpp>
 #include <tl/optional.hpp>
 
 #include <tuple>

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());
-}
+}

tests/main.cpp

@@ -1,2 +0,0 @@
-#define CATCH_CONFIG_MAIN
-#include "catch.hpp"

tests/make_optional.cpp

@@ -1,4 +1,4 @@
-#include "catch.hpp"
+#include <catch2/catch.hpp>
 #include <tl/optional.hpp>
 
 #include <tuple>

tests/noexcept.cpp

@@ -1,4 +1,4 @@
-#include "catch.hpp"
+#include <catch2/catch.hpp>
 #include <tl/optional.hpp>
 
 TEST_CASE("Noexcept", "[noexcept]") {

tests/nullopt.cpp

@@ -1,4 +1,4 @@
-#include "catch.hpp"
+#include <catch2/catch.hpp>
 #include <tl/optional.hpp>
 
 TEST_CASE("Nullopt", "[nullopt]") {

tests/observers.cpp

@@ -1,4 +1,4 @@
-#include "catch.hpp"
+#include <catch2/catch.hpp>
 #include <tl/optional.hpp>
 
 struct move_detector {

tests/relops.cpp

@@ -1,4 +1,4 @@
-#include "catch.hpp"
+#include <catch2/catch.hpp>
 #include <tl/optional.hpp>
 
 TEST_CASE("Relational ops", "[relops]") {

tests/swap.cpp

@@ -1,4 +1,4 @@
-#include "catch.hpp"
+#include <catch2/catch.hpp>
 #include <tl/optional.hpp>
 
 TEST_CASE("Swap value", "[swap.value]") {