OmniNet 0.7.2: 5 codemax TLS bug fixes

Commits since 0.7.1:

  45cae5b Fix Bug 3: TLSSocket::readLine() overrides base
    Previously, calling readLine() on a TLSSocket used the inherited
    Socket::readLine() which calls raw ::recv() on the underlying fd,
    bypassing SSL_read. The result was raw TLS ciphertext (the
    record header bytes) which looked like 'malformed status line'
    to text-line parsers. Override readLine() to use the overridden
    recv() (which goes through SSL_read), one byte at a time.

  fc97be9 Fix Bug 4: load system CA + SSL_VERIFY_PEER by default
    Previously, initContext() created an SSL_CTX but didn't load any
    CA certs and didn't set a verify mode. OpenSSL's default is
    SSL_VERIFY_NONE, and setVerifyMode(PEER) on its own doesn't
    load the CA store. So setVerifyMode(PEER) + connect() would
    silently accept forged certificates. Fix: in initContext(),
    for client contexts, call SSL_CTX_set_default_verify_paths()
    and SSL_CTX_set_verify(m_ctx, SSL_VERIFY_PEER, nullptr).
    Callers can still override via setVerifyMode(NONE).

  913e44b Fix Bug 1 + 5: implement TLSContext::createClient/createSocket
    Previously, TLSContext::createClient() and createSocket() were
    declared but never defined - link failed with 'undefined
    reference'. createServer() was also unimplemented. Made
    TLSContext inherit std::enable_shared_from_this so createSocket()
    can use shared_from_this(). Implemented createServer(),
    createClient(), createSocket(), and the private ctor + dtor.
    Added TLSSocket(shared_ptr<TLSContext>) constructor and
    setContext() helper for adopting a shared context.

  d508494 Fix Bug 2: setALPNProtocols() actually sets ALPN
    Previously, setALPNProtocols() was a no-op stub. Without ALPN,
    modern HTTPS servers (Cloudflare, GitHub, Google) default to
    HTTP/2 which has a binary wire format incompatible with text-line
    HTTP/1.1 parsers - resulting in garbage status lines like
    'PRI * HTTP/2.0'. Fix: build the ALPN wire format (RFC 7301)
    and call SSL_CTX_set_alpn_protos() on m_ctx. getALPNProtocol()
    was already implemented correctly.

Plus: CodeMax.md updates tracking the work.

Tests: test_omnet_test 110/110 PASS, test_sync_http_server 18/18 PASS.
Full build clean, zero warnings. All 5 codemax integration bugs fixed.