Fix checkJsonError messages

The $value string was not set inside checkJsonError, so it was not possible to see the data which caused the error
Network Detection Support for Wansview

Basis support for Wansview Cams
Tested with NC541W
Fixed web/skins/*/includes/config.php not being installed
Removed installation of web/README.md from cmake
Merge pull request #257 from Phhere/patch-2

Network Detection Support for Wansview
Merge pull request #256 from Phhere/patch-1

Fix checkJsonError messages
Added support for UYVY capture palette (required for some Bluecherry cards)
Detection Support for WansView Cams

Support for detection of Wansview Cams which are connected by lan
Merge pull request #268 from Phhere/patch-3

Improve detection for WansView cameras