common_headers/delegate.H: allow explicit cast of incompatible function pointers
common_headers/rgc.H: added DefaultAllocator
cpoll: String: added constructor for nullptr_t
cppsp: added ability to load modules without creating Page instances, and static file caching
cppsp: Server: added hooks for determining if a file is static, and for url rewriting
cppsp: remove default handlers (will be replaced by url rewriting); added static file handling
common_headers/delegate.H: added nullDelegate and DelegateChain
no-op
cppsp: loadable module support
cppsp: seed random number generator with pid xor time (when using forking mode)