compatibility fixes for net framework build

Fix the stream latency sample settings (unosquare#458)

Preparing fro release 3.10

adding nugetdoc.md

minor updates to nuget package

Updating readmes and nuspec before NuGet release. Final commit of ver…

…sion 2.8

Seek Improvements and Indexing (unosquare#280)

* starting with seek indexing. Related to issue unosquare#139

* continued work on seek indexing.

* Generalizing sorted binary search algorithm. Continued work on seek indices. See issues unosquare#250 and unosquare#139

* improved and simplified seek logic.

* minor renaming and added seek error checking.

* logging when using a video seek index entry.

* fixing frame start offset by offseting them by main component.

bumping up version before release

Preparing for 4.0.250 release

Preparing for 2.40 release