5.0 Patch - Fix animated image issue

Fixes

• Fix SDWebImageDecodeFirstFrameOnly flag is ignored when image loaded from cache #2725
• Fix that SDAnimatedImageView initWithImage will skip the initialize logic and crash #2728
• Replace if judge with MAX() function in scale less than 1 #2710

Project

• Replace the private prefix header files with the manually import for each implementation files #2723

Tests

• Added many test case to ensure the code behavior and coverage #2711

Documentation

• Update the documentation coverage for jazzy. Use the correct format to provide class/protocol/type API Documentation #2722