avlib.vdplugin 0.6.1.70

The "VirtualDub2 cch_input" code (https://sourceforge.net/p/vdfiltermod/cch_input/ci/master/tree/) from 2020-03-15 was forked and adapted for Visual Studio 2017/2019/2022.
FFmpeg 6.1.1 is now supported.
Removed CineForm HD (native) codec.
Removed manual lazy loading of DDL for FFmpeg DDLs.
Removed support for systems older than Windows 7.
The 32-bit plugin is not implemented because there is no official build of FFmpeg 6.1.1 for x86.