HPCC-9487 ESP should set IE=edge for certain ECLIDE HTTP responses

For certain content, ECLIDE needs ESP to set the HTTP header
X-UA-Compatible to "IE=edge" and add <!DOCTYPE html> to the content.

This triggers the IE activex plugin to render in the proper content
mode.

Signed-off-by: Anthony Fishbeck <Anthony.Fishbeck@lexisnexis.com>