CharsetDetection::GetBomEncoding: fix: remove unused leftover parameter
StringUtils::TrimLeft: fix: if string contains only trim chars then string must be erased instead of left untouched
StringUtils::TrimLeft/TrimRight: pass trimming chars as constant character strings
StringUtils::Trim: add overload with trim chars parameter
HttpHeader: fix: parse header properly according to RFC 2616
* use 'tab' as whitespace as well as 'space'
* process header lines divided to several lines with whitespace
HttpHeader::GetMimeType: fix: trim whitespace chars according to RFC2616
HttpHeader::GetCharset: fix: properly find charset according to RFC 2616
* allow more than one whitespace
* use 'tab' for whitespace too
* allow charset to be quoted