Support MacOS (#365)

通过这个PR，FreeKill可以在MacOS上编译运行。

在repo根目录运行 `./build/FreeKill`，游戏可玩，有背景音，但是出牌语音似乎没了。是我的运行方式有问题么？

docs/inner/01-compile.rst

@@ -98,7 +98,25 @@ Linux服务器
 MacOS
 -----
 
-大致与Windows类似，但尚且缺少确切的方案。
+安装依赖：
+
+.. code:: sh
+
+   $ brew install libgit2 swig qt lua
+
+更新submodule：
+
+.. code:: sh
+
+   $ git submodule update --init --recursive
+
+然后使用命令行编译：
+
+.. code:: sh
+
+   $ mkdir build && cd build
+   $ cmake ..
+   $ make -j8
 
 --------------
 

lang/en_US.ts

@@ -1,4 +1,4 @@
-<!DOCTYPE TS><TS>
+<!DOCTYPE TS><TS language="en_US">
 
 <context>
   <name>Init</name>

lang/zh_CN.ts

@@ -1,4 +1,4 @@
-<!DOCTYPE TS><TS>
+<!DOCTYPE TS><TS language="zh_CN">
 <context>
   <name>ClientSocket</name>
   <message>

src/CMakeLists.txt

@@ -63,6 +63,30 @@ elseif (ANDROID)
     QT_ANDROID_EXTRA_LIBS "${LUA_LIB};${SQLITE3_LIB};${CRYPTO_LIB};${SSL_LIB};${SSH_LIB};${GIT_LIB}"
   )
   list(REMOVE_ITEM QT_LIB Qt6::QuickControls2)
+elseif (APPLE)
+  set(LUA_LIB ${LUA_LIBRARIES})
+  set(SQLITE3_LIB sqlite3)
+  set(CRYPTO_LIB OpenSSL::Crypto)
+  set(READLINE_LIB readline)
+
+  set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "/opt/homebrew/Cellar/libgit2")
+  find_package(PkgConfig)
+  if (PkgConfig_FOUND)
+    pkg_check_modules(LIBGIT2 libgit2)
+    if (LIBGIT2_FOUND)
+      message(STATUS "Found libgit2: ${LIBGIT2_LIBRARIES}")
+    else ()
+      message(WARNING "libgit2 not found, try to find libgit2 by CMake")
+      find_package(LibGit2)
+    endif ()
+  else ()
+    message(WARNING "PkgConfig not found, try to find libgit2 by CMake")
+    find_package(LibGit2)
+  endif ()
+  set(GIT_LIB ${LIBGIT2_LIBRARIES})
+  target_link_directories(FreeKill PRIVATE
+    ${LIBGIT2_LIBRARY_DIRS}
+  )
 else ()
   set(LUA_LIB lua5.4)
   set(SQLITE3_LIB sqlite3)