Numerous memory bugs, fragmentation issues & spec. noncompliances

[uNetworkingAB]

Hello, I have a quick and basic integration test that triggers the following bugs in mrhttp:

• 9 Valgrind Conditional jump or move depends on uninitialised value(s)
• Many fragmentation bugs
• Many spec. compliance bugs

Test is here: https://github.com/uNetworking/h1spec