Avisynth+ r2574-MT

Avisynth+ r2574 (20171219)

Fixes

• MaskHS created inverse mask. Regression after r2173
• jitasm code generation at specific circumstances

modification, additions

• Expr:
  • new: Indexable source clip pixels by relative x,y positions like x[-1,1]
  • new functions: sin cos tan asin acos atan
  • new operator: % (modulo)
  • new: Variables: uppercase letters A..Z for storing and reuse temporary results, frequently used computations.
  • new: predefined expr variables 'frameno', 'time', 'width', 'height'
  • fix: jitasm code generation at specific circumstances

Other

• Build: changed avisynth.h, strict C++ conformity with Visual Studio 2017 /permissive- flag
• Installer (finally)