fix DrawText func && add enum with text encoding && update manual && other

.vscode/settings.json

@@ -4,9 +4,14 @@
     "files.associations": {
         "stdlib.h": "c",
         "ksys.h": "c",
-        "socket.h": "c"
+        "socket.h": "c",
+        "graphic.h": "c"
     },
     "cSpell.words": [
+        "syscalls",
+        "INET",
+        "IPPROTO",
+        "DGRAM",
         "ksys",
         "ksys_oskey_t",
         "LUALIB_API",
@@ -15,17 +20,18 @@
         "tonumber",
         "luaL_newmetatable",
         "luaL_setmetatable",
-        "lua_createtable",
         "luaL_setfuncs",
         "luaL_checkinteger",
         "luaL_checkstring",
         "luaL_checkudata",
+        "luaL_optinteger",
         "lua_pushboolean",
         "lua_pushinteger",
         "lua_pushnumber",
-        "luaL_optinteger",
         "lua_pushstring",
         "lua_pushnil",
+        "lua_createtable",
+        "lua_newtable",
         "lua_touserdata",
         "lua_setfield",
         "lua_getfield",