Changes to RSSDK 2.0 grabber

[SergioRAgostinho]

OK. My plan was to compile and include these files only under Windows and fork a new a issue to address the failures under Linux.

Originally posted by @SergioRAgostinho in #2214 (comment)

Expanding on this topics with a list of items to address before the release:

• Restrict the building the grabber to Windows only.
• Address my final review comments in the original PR and remove some unnecessary checks.
• Fix warnings raise from not using std:: int types.

[taketwo]

One more thing: fix warnings, there are plenty because of using int types without std:: prefix.