feat(Cmake): set minimal support version 3.8 and added interface libs for world and auth (#2295)

* Added interface library authserver-interface
* Added interfaca library worldserver-interface
* Added Copyright's in auth and world server Cmake's files

src/server/authserver/CMakeLists.txt

@@ -1,4 +1,5 @@
-# Copyright (C)
+#
+# Copyright (C) 2016+     AzerothCore <www.azerothcore.org>, released under GNU AGPL3 v3 license: https://github.com/azerothcore/azerothcore-wotlk/blob/master/LICENSE-AGPL3
 #
 # This file is free software; as a special exception the author gives
 # unlimited permission to copy and/or distribute it, with or without
@@ -30,22 +31,7 @@ endif()
 # Group sources
 GroupSources(${CMAKE_CURRENT_SOURCE_DIR})
 
-add_executable(authserver
-  ${PRIVATE_SOURCES}
-)
-
-add_dependencies(authserver revision.h)
-
-if( NOT WIN32 )
-  set_target_properties(authserver PROPERTIES
-    COMPILE_DEFINITIONS _TRINITY_REALM_CONFIG="${CONF_DIR}/authserver.conf"
-  )
-endif()
-
-target_link_libraries(authserver
-  PUBLIC
-    common
-)
+add_library(authserver-interface INTERFACE)
 
 CollectIncludeDirectories(
   ${CMAKE_CURRENT_SOURCE_DIR}
@@ -53,9 +39,27 @@ CollectIncludeDirectories(
   # Exclude
   ${CMAKE_CURRENT_SOURCE_DIR}/PrecompiledHeaders)
 
-target_include_directories(authserver
+target_include_directories(authserver-interface
+  INTERFACE
+    ${PUBLIC_INCLUDES})
+
+add_executable(authserver
+  ${PRIVATE_SOURCES})
+
+add_dependencies(authserver revision.h)
+
+if(NOT WIN32)
+  set_target_properties(authserver PROPERTIES
+    COMPILE_DEFINITIONS _TRINITY_REALM_CONFIG="${CONF_DIR}/authserver.conf")
+endif()
+
+target_link_libraries(authserver
+  PRIVATE
+    authserver-interface
   PUBLIC
-    ${PUBLIC_INCLUDES}
+    common)
+
+target_include_directories(authserver
   PRIVATE
     ${CMAKE_CURRENT_BINARY_DIR})