libSceCompanionHttpd technical debt

sceCompanionHttpdOptParamInitialize, sceCompanionHttpdInitialize (libSceCompanionHttpd) - the option block is taken as 0x60 bytes: titles fill a work memory pointer at +0x08, its size at +0x10 and a temporary data mount point at +0x58 after sceCompanionHttpdOptParamInitialize. Its other fields and the defaults the console writes are unknown, so sceCompanionHttpdOptParamInitialize zeroes the 0x60 bytes and sceCompanionHttpdInitialize reads none of them; both reject a null block with INVALID_PARAM
sceCompanionHttpdAddHeader, sceCompanionHttpdSetStatus, sceCompanionHttpdSetBody (libSceCompanionHttpd) - imported by PS4 titles and added without an implementation. They fill the response of a request callback, which is never called here, so every call throws
sceCompanionHttpdGet2ndScreenStatus, sceCompanionHttpdGetUserId, sceCompanionHttpdInitialize2, sceCompanionHttpdRegisterRequestBodyReceptionCallback, sceCompanionHttpdRegisterRequestCallback2, sceCompanionHttpdUnregisterRequestBodyReceptionCallback (libSceCompanionHttpd) - the rest of the library's exports, declared without parameters and without an implementation; their signatures are not verified, so every call throws

Companion server state (libSceCompanionHttpd) - no HTTP server listens, so no companion device ever connects: sceCompanionHttpdGetEvent returns NO_EVENT without writing the event and the request callback is never called. Initialization, callback registration and start and stop are tracked with the errors of shadPS4's companion_error.h (ALREADY_REGISTERED is 0x80E4000C, between NOT_STARTED and NOT_CONNECTED; the header has 0x80E4000, one digit short). Unregistering with no callback and terminating a started server throw, since the console's answers are unknown. Not measured on a console. Closes when: a companion server is hosted

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