Streaming I/O and support of named pipes (#570)

* added streaming i/o for scripting, and a byteutil.get_size function

* added i/o stream class, also added named pipes support on lua side via ffi

* added constant file.named_pipes_prefix

* added buffered and yield modes for io_stream

* added new time function for work with UTC - utc_time, utc_offset, local_time

* docs updated

* constant pid moved to os.pid

* now gmtime_s and localtime_s used only in windows

res/modules/internal/stream_providers/named_pipe_path_validate.lua

@@ -0,0 +1,21 @@
+local forbiddenPaths = {
+    "/..\\", "\\../",
+    "/../", "\\..\\"
+}
+
+return function(path)
+    local corrected = true
+
+    if path:starts_with("../") or path:starts_with("..\\") then
+        corrected = false
+    else
+        for _, forbiddenPath in ipairs(forbiddenPaths) do
+            if path:find(forbiddenPath) then
+                corrected = false
+                break
+            end
+        end    
+    end
+
+    if not corrected then error "special path \"../\" is not allowed in path to named pipe" end
+end