remove some warning

[coco875]

warning that I remove:

• remove deplicate macro definition in controller.h.
• avoid redefine _LANGUAGE_C.
• only add -Wno-implicit-function-declaration when he compile for C or OBJC.
• fix multiple useless typedef.
• add attribute for some unused.
• add cast for when it's not the same type of int (not fixing all).

[coco875]

hmm how you want to add attribute macro ? for other os

[Kenix3]

hmm how you want to add attribute macro ? for other os

We don't really have a standard for this. Will need to do some research to see how it's handled in other projects.

[louist103]

hmm how you want to add attribute macro ? for other os

[[maybe_unused]] and [[fallthrough]] are in C++ as of c++17 and should work on all platforms

[Kenix3]

hmm how you want to add attribute macro ? for other os

[[maybe_unused]] and [[fallthrough]] are in C++ as of c++17 and should work on all platforms

@coco875