Building Unified Buffer Library in Vivado HLS

[joyliu37]

• Improve Unified Buffer Library into template support up to 3D in Jing's line buffer style
• Add testcase multiple channel convolution using circular line buffer as a real unified buffer
• Line Buffer Lib support address stream
• Address Generator
• Bank selector support different I/O port
• Psum Buffer with update state
• VGGnet Pass
• Mobilenet Pass