HttpClient using libcurl, Unix Sockets for HTTP. HTTPS support (#770)

The main goal of this change is to eliminate the cpr back-end altogether and replace it with the curl implementation. I would expect to drop cpr as soon as we feel happy with the libcurl back-end. That would leave us with a direct dependency on libcurl only, and cpr can be eliminated as a dependency.

### HttpClient Backend Overhaul
- Implemented a new **libcurl-based HttpClient** backend (`httpclientcurl.cpp`, ~2000 lines)
  as an alternative to the cpr-based one
- Made HttpClient backend **configurable at runtime** via constructor arguments
  and `-httpclient=...` CLI option (for zen, zenserver, and tests)
- Extended HttpClient test suite to cover multipart/content-range scenarios

### Unix Domain Socket Support
- Added Unix domain socket support to **httpasio** (server side)
- Added Unix domain socket support to **HttpClient**
- Added Unix domain socket support to **HttpWsClient** (WebSocket client)
- Templatized `HttpServerConnectionT<SocketType>` and `WsAsioConnectionT<SocketType>`
  to handle TCP, Unix, and SSL sockets uniformly via `if constexpr` dispatch

### HTTPS Support
- Added **preliminary HTTPS support to httpasio** (for Mac/Linux via OpenSSL)
- Added **basic HTTPS support for http.sys** (Windows)
- Implemented HTTPS test for httpasio
- Split `InitializeServer` into smaller sub-functions for http.sys

### Other Notable Changes
- Improved **zenhttp-test stability** with dynamic port allocation
- Enhanced port retry logic in http.sys (handles ERROR_ACCESS_DENIED)
- Fatal signal/exception handlers for backtrace generation in tests
- Added `zen bench http` subcommand to exercise network + HTTP client/server communication stack

1 files changed, 6 insertions, 5 deletions

diff --git a/src/zencore/sentryintegration.cpp b/src/zencore/sentryintegration.cpp
index 8d087e8c6..58b76783a 100644
--- a/src/zencore/sentryintegration.cpp
+++ b/src/zencore/sentryintegration.cpp
@@ -60,11 +60,12 @@ public:
 		}
 		try
 		{
-			std::string	   Message = fmt::format("{}\n{}({})", Msg.GetPayload(), Msg.GetSource().Filename, Msg.GetSource().Line);
-			sentry_value_t Event   = sentry_value_new_message_event(
-				  /*   level */ MapToSentryLevel[Msg.GetLevel()],
-				  /*  logger */ nullptr,
-				  /* message */ Message.c_str());
+			const char*	   Filename = Msg.GetSource().Filename ? Msg.GetSource().Filename : "<unknown>";
+			std::string	   Message	= fmt::format("{}\n{}({})", Msg.GetPayload(), Filename, Msg.GetSource().Line);
+			sentry_value_t Event	= sentry_value_new_message_event(
+				   /*   level */ MapToSentryLevel[Msg.GetLevel()],
+				   /*  logger */ nullptr,
+				   /* message */ Message.c_str());
 			sentry_event_value_add_stacktrace(Event, NULL, 0);
 			sentry_capture_event(Event);
 		}