less warnings...

CID:167134,167136,167137,167138,167139,167141

CID:167135

to https://github.com/ofTheo/videoInput/tree/c3b9f78fe5a46035c58009a4bbefacd67ef08cf0

Closes: https://github.com/umlaeute/Gem/issues/158
breaks ABI & (inheritance) API

if the string is const, we can as well pass it by reference...

these changes should be API compatible, but might break ABI

pre C++-11

required, since the parent class bad_cast() does it as well...

noexcept is only available since C++-11

https://github.com/umlaeute/Gem/issues/165

now that we have consistent (inverted) Y-axis for images, we can finally get the output correct...

https://github.com/umlaeute/Gem/issues/175