Use correct return codes from mac CCApplication
use new ccHttpRequestCallback.
Merge pull request #6372 from twhittock/mac-application-retcodes

Returns correct value for Application::run on Mac platform
CC_CALLBACK_2 not std::bind directly
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Merge pull request #6373 from xhcnb/deprecated_callback

use new ccHttpRequestCallback.
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Merge branch 'v3' into develop_migrate_math_lib