v1.6.0

• Supports new Intel instructions: SERIALIZE, XSUSLDTRK, XRESLDTRK
• Supports new AMD instructions: PSMASH, PVALIDATE, RMPADJUST, RMPUPDATE
• Added PreferST0 formatter option (fadd st,st(3) vs fadd st(0),st(3))
• Added Decoder.InvalidNoMoreBytes which is true if the decoded instruction is invalid because there are no more bytes left.
• Moved gas/masm/nasm-specific formatter options to the base options class