Fix/be respectful of special characters like exclamation marks in highlight phrases since they are also word boundaries (#1890)

* Add missing includes

We would normally have these included in another file already, or even
the precompiled headers, but having the files included here too makes
testing single parts easier.

* Modify the regex building of highlight phrases for non-regex phrases

For phrases like !test, the word boundary checking we did before was not
enough, so we now check for either a word boundary, a whitespace
character, or the line start/end.

* Add tests for ensuring I haven't fully broken the highlight system

* Add changelog entry

CMakeLists.txt

@@ -6,11 +6,11 @@ include_directories(src)
 
 set(chatterino_SOURCES
     src/common/UsernameSet.cpp
+    src/controllers/highlights/HighlightPhrase.cpp
     )
 
-find_package(Qt5Widgets CONFIG REQUIRED)
 find_package(Qt5 5.9.0 REQUIRED COMPONENTS
-    Core
+    Core Widgets
     )
 
 # set(CMAKE_AUTOMOC ON)
@@ -25,12 +25,18 @@ if (BUILD_TESTS)
 
         tests/src/main.cpp
         tests/src/UsernameSet.cpp
+        tests/src/HighlightPhrase.cpp
         )
 
-    target_link_libraries(chatterino-test Qt5::Core)
+    target_link_libraries(chatterino-test Qt5::Core Qt5::Widgets)
 
     target_link_libraries(chatterino-test gtest gtest_main)
 
+    set(BUILD_TESTS OFF)
+    add_subdirectory(${CMAKE_CURRENT_LIST_DIR}/lib/serialize PajladaSerialize)
+
+    target_link_libraries(chatterino-test PajladaSerialize)
+
     gtest_discover_tests(chatterino-test)
 else()
     message(FATAL_ERROR "This cmake file is only intended for tests right now. Use qmake to build chatterino2")