Remove unused indent functions in ser_json and ser_ron and remove d: usize depth parameter - #163

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struct `Vec2` is never constructed

struct `Vec2` is never constructed

variable does not need to be mutable

struct `Foo` is never constructed

struct `Vec2` is never constructed

enum `Message` is never used

enum `TestEnum` is never used

struct `Vec2` is never constructed

enum `Message` is never used

enum `TestEnum` is never used

struct `Vec2` is never constructed

struct `Foo` is never constructed