On server, channel dprint through the readline-device. Also some refactors and quality improvements.

luprex/cpp/drv/driver-linux.cpp

@@ -1,7 +1,6 @@
 
 
 #include "drvutil.hpp"
-#include "osdrvutil.hpp"
 #include "sslutil.hpp"
 #include "readline.hpp"
 #include "../core/enginewrapper.hpp"
@@ -220,21 +219,8 @@ static int socket_poll(struct pollfd *pollvec, int pollcount, int mstimeout, std
 }
 
 // Write unicode onto the console.
-static void console_write(const std::u32string &cps) {
-    std::string utf8 = drvutil::utf32_to_utf8(cps);
-    write(1, utf8.c_str(), utf8.size());
-}
 
-static std::u32string console_read() {
-    std::u32string result;
-    char buffer[512];
-    int nread = read(0, buffer, 512);
-    if (nread > 0) {
-        std::string_view s(buffer, nread);
-        result = drvutil::utf8_to_utf32(s, nullptr);
-    }
-    return result;
-}
+
 
 static void call_init_engine_wrapper(const std::filesystem::path &luprexroot, EngineWrapper *w) {
     using InitFn = void (*)(EngineWrapper *);