Continued reducing WGI and move implementation to WSF (Web Server Framework)

Removed many usage of READABLE_STRING_GENERAL in favor to READABLE_STRING_8
   to avoid potential nasty issues in user's code
URI-template is working only with STRING_8, then changed any _GENERAL or _STRING_32 to _STRING_8

library/protocol/http/src/http_file_extension_mime_mapping.e

@@ -126,7 +126,6 @@ feature {NONE} -- Initialization
 			end
 		end
 
-
 feature -- Access
 
 	mime_type (ext: READABLE_STRING_8): detachable READABLE_STRING_8