Update Webserver

Upate get_routes to use the correct constness for its use case
crow to set json_mode if json value is populated
Delete std::array bytes API due to major efficiency issues.  To be
replaced with span API in near future
Implement a catch block for handlers that can throw exceptions
Implement direct handling of routes that end with / to better support
redfish.
    /foo and /foo/ now invoke the same handler insead of issuing a 301
redirect
Update nlohmann to latest version
Implement one nlohmann endpoint with exceptions disabled
Implement first pass at a IBM style rest-dbus interface
Fix pam authentication to call dropbear auth methods
Implements first pass at redfish interface.  Shemas avaialble pass
redfish validation 100%
Use response json object rather than request json object.
Update authorization middleware to be redfish compliant
UPdate random token generation to be more efficient, and not base64
bytes, generate bytes directly

Change-Id: I63cc2005c1a21f5c2f5168777a4e09f3c965a34f