Added automatic toolchain, gcc and make installation

Editor/ToolchainChecker.cs

@@ -0,0 +1,65 @@
+using UnityEngine;
+using System.Diagnostics;
+using System.Linq;
+
+public static class ToolchainChecker
+{
+    public static readonly string[] requiredTools = new[]
+    {
+        "mipsel-linux-gnu-addr2line",
+        "mipsel-linux-gnu-ar",
+        "mipsel-linux-gnu-as",
+        "mipsel-linux-gnu-cpp",
+        "mipsel-linux-gnu-elfedit",
+        "mipsel-linux-gnu-g++",
+        "mipsel-linux-gnu-gcc",
+        "mipsel-linux-gnu-gcc-ar",
+        "mipsel-linux-gnu-gcc-nm",
+        "mipsel-linux-gnu-gcc-ranlib",
+        "mipsel-linux-gnu-gcov",
+        "mipsel-linux-gnu-ld",
+        "mipsel-linux-gnu-nm",
+        "mipsel-linux-gnu-objcopy",
+        "mipsel-linux-gnu-objdump",
+        "mipsel-linux-gnu-ranlib",
+        "mipsel-linux-gnu-readelf",
+        "mipsel-linux-gnu-size",
+        "mipsel-linux-gnu-strings",
+        "mipsel-linux-gnu-strip"
+    };
+
+    /// <summary>
+    /// Checks for the availability of a given tool by using a system command.  
+    /// "where" is used on Windows and "which" on other platforms.
+    /// </summary>
+    public static bool IsToolAvailable(string toolName)
+    {
+        string command = Application.platform == RuntimePlatform.WindowsEditor ? "where" : "which";
+
+        try
+        {
+            Process process = new Process
+            {
+                StartInfo = new ProcessStartInfo
+                {
+                    FileName = command,
+                    Arguments = toolName,
+                    RedirectStandardOutput = true,
+                    RedirectStandardError = true,
+                    UseShellExecute = false,
+                    CreateNoWindow = true
+                }
+            };
+
+            process.Start();
+            string output = process.StandardOutput.ReadToEnd().Trim();
+            process.WaitForExit();
+
+            return !string.IsNullOrEmpty(output);
+        }
+        catch
+        {
+            return false;
+        }
+    }
+}