Some terribleness to make updating work on windows

Squirrel doesn't handle the executable changing name, as hopefully
explained in comments

build/rebrand_stub/rebrand_stub.c

@@ -0,0 +1,51 @@
+#include <windows.h>
+#include <stdio.h>
+#include <string.h>
+#include <tchar.h>
+
+/*
+ * This just runs 'Element (Riot).exe' with the same args as
+ * this process was invoked with. This gets around the fact that
+ * squirrel always tries to run an executable with the same name,
+ * so fails to restart if the app's name has changed.
+ */
+void _tmain( int argc, TCHAR *argv[] )
+{
+    LPSTR myCmdLine = GetCommandLineA();
+    char cmdLine[32767];
+
+    LPSTR cmdLinePos = cmdLine;
+    LPSTR toRun = "\"Element (Riot).exe\" ";
+    strncpy(cmdLinePos, toRun, strlen(toRun));
+    cmdLinePos += strlen(toRun);
+
+    if (myCmdLine[0] == '"') ++myCmdLine;
+    myCmdLine += strlen(argv[0]);
+    if (myCmdLine[0] == '"') ++myCmdLine;
+    if (myCmdLine[0] == ' ') ++myCmdLine;
+
+    strncpy(cmdLinePos, myCmdLine, (cmdLine + 32767) - cmdLinePos);
+
+    STARTUPINFO si;
+    PROCESS_INFORMATION pi;
+
+    ZeroMemory(&si, sizeof(si));
+    si.cb = sizeof(si);
+    ZeroMemory(&pi, sizeof(pi));
+
+    if (!CreateProcess(NULL,
+        cmdLine,        // Command line
+        NULL,           // Process handle not inheritable
+        NULL,           // Thread handle not inheritable
+        FALSE,          // Set handle inheritance to FALSE
+        0,              // No creation flags
+        NULL,           // Use parent's environment block
+        NULL,           // Use parent's starting directory 
+        &si,            // Pointer to STARTUPINFO structure
+        &pi )           // Pointer to PROCESS_INFORMATION structure
+    ) 
+    {
+        printf("CreateProcess failed (%d).\n", GetLastError());
+        return;
+    }
+}