Updated BasicObject

[sampersand]

This updates BasicObject—mostly to use implicit types—and also adds modernized unit tests.

More specifically,

• BasicObject#__send__: Now accepts interned for method name, **untyped positional arguments, and an optional ?{ (*untyped, **untyped) -> untyped } block.
• BasicObject#equal? has been made an alias of BasicObject#==
• BasicObject#instance_eval Now accepts (string, ?string, ?int) instead of (String, ?Strig, ?Integer)
• BasicObject#initialize returns nil instead of void
• BasicObject#singleton_method_added: Gave a name to the Symbol parameter, now returns nil instead of void.
• BasicObject#singleton_method_removed: Gave a name to the Symbol parameter, now returns nil instead of void.
• BasicObject#singleton_method_undefined: Gave a name to the Symbol parameter, now returns nil instead of void.

[soutaro]

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