Add script to count globals in use

scripts/stats/count-rct-globals.php

@@ -0,0 +1,47 @@
+#!/usr/bin/env php
+<?php
+
+exec("grep -E '(RCT2_ADDRESS|RCT2_GLOBAL)[\(\s]+(0x[0-9a-zA-Z]+|[A-Z0-9_]+)' -r -o .", $lines);
+
+$addressFiles = [];
+$lastFile = null;
+$count = [];
+$totalCount = 0;
+
+foreach ($lines as $line) {
+    $fileName = $lastFile;
+    if (strpos($line, ':') !== false) {
+        $data = explode(':', $line);
+        $fileName = $data[0];
+        $line = $data[1];
+        $lastFile = $fileName;
+    }
+
+    $line = preg_replace_callback('/0x0+([0-9A-Fa-f])/', function ($matches) {
+        return '0x' . strtoupper($matches[1]);
+    }, $line);
+    $line = preg_replace('/RCT2_(GLOBAL|ADDRESS)[\(\s]+/', '', $line);
+
+    if (!isset($addressFiles[$line])) {
+        $addressFiles[$line] = [];
+    }
+    $addressFiles[$line][] = $fileName;
+
+    if (!isset($count[$line])) {
+        $count[$line] = 0;
+    }
+
+    $count[$line]++;
+    $totalCount++;
+}
+
+if (isset($argv[1]) && $argv[1] === '-v') {
+    foreach ($count as $name => $c) {
+        printf("%s\t%d\t%s\n", $name, $c, implode(", ", array_unique($addressFiles[$name])));
+    }
+
+    echo "\n";
+}
+
+
+printf("Found %d usages of RCT2_ADDRESS and RCT2_GLOBAL (%d distinct)\n", $totalCount, count($count));