fixup! Rename warnings.cache into output.cache

Author: facchinm

constants/constants.go

@@ -90,7 +90,7 @@ const FILE_PLATFORM_LOCAL_TXT = "platform.local.txt"
 const FILE_PLATFORM_TXT = "platform.txt"
 const FILE_PROGRAMMERS_TXT = "programmers.txt"
 const FILE_INCLUDES_CACHE = "includes.cache"
-const FILE_WARNINGS_CACHE = "warnings.cache"
+const FILE_WARNINGS_CACHE = "output.cache"
 const FOLDER_BOOTLOADERS = "bootloaders"
 const FOLDER_CORE = "core"
 const FOLDER_CORES = "cores"