Various fixes and additions to PlistBuddy.

 - Fix `Exit` command in PlistBuddy to actually exit.
 - Fix `Key:` syntax in PlistBuddy to append to arrays.
 - Fix `Set Key:0` syntax in PlistBuddy to overwrite, not insert.
 - Fix PlistBuddy to correctly initialize new property lists: only
   write to disk on `Save` and start out with a dictionary.
 - Fix crashes with out-of-bounds array indexes in PlistBuddy.
 - Add `Import`, `Copy`, and `Revert` commands to PlistBuddy.

Libraries/plist/CMakeLists.txt

@@ -66,11 +66,11 @@ target_include_directories(plist PRIVATE "${CMAKE_CURRENT_SOURCE_DIR}/PrivateHea
 install(TARGETS plist DESTINATION usr/lib)
 
 add_executable(plutil Tools/plutil.cpp)
-target_link_libraries(plutil plist process util)
+target_link_libraries(plutil PRIVATE plist process util)
 install(TARGETS plutil DESTINATION usr/bin)
 
 add_executable(PlistBuddy Tools/PlistBuddy.cpp)
-target_link_libraries(PlistBuddy plist util)
+target_link_libraries(PlistBuddy PRIVATE plist util)
 install(TARGETS PlistBuddy DESTINATION usr/bin)
 
 set(LINENOISE_ROOT "${CMAKE_SOURCE_DIR}/ThirdParty/linenoise")
@@ -82,7 +82,7 @@ if (EXISTS "${LINENOISE_SOURCE}")
     target_compile_definitions(linenoise PRIVATE _GNU_SOURCE)
   endif ()
 
-  target_link_libraries(PlistBuddy linenoise)
+  target_link_libraries(PlistBuddy PRIVATE linenoise)
   target_compile_definitions(PlistBuddy PRIVATE HAVE_LINENOISE)
 endif ()