Convert generate_interfaces from cpp to py

Convert it so it shouldn't have to be built for os/arch specific, only python needed.

tools/generate_interfaces/generate_interfaces.py

@@ -0,0 +1,76 @@
+import re
+import sys
+
+interface_patterns = [
+    r"SteamClient\d+",
+
+    r"SteamGameServerStats\d+",
+    r"SteamGameServer\d+",
+
+    r"SteamMatchMakingServers\d+",
+    r"SteamMatchMaking\d+",
+
+    r"SteamUser\d+",
+    r"SteamFriends\d+",
+    r"SteamUtils\d+",
+    r"STEAMUSERSTATS_INTERFACE_VERSION\d+",
+    r"STEAMAPPS_INTERFACE_VERSION\d+",
+    r"SteamNetworking\d+",
+    r"STEAMREMOTESTORAGE_INTERFACE_VERSION\d+",
+    r"STEAMSCREENSHOTS_INTERFACE_VERSION\d+",
+    r"STEAMHTTP_INTERFACE_VERSION\d+",
+    r"STEAMUNIFIEDMESSAGES_INTERFACE_VERSION\d+",
+
+    r"STEAMCONTROLLER_INTERFACE_VERSION",
+    r"SteamController\d+",
+
+    r"STEAMUGC_INTERFACE_VERSION\d+",
+    r"STEAMAPPLIST_INTERFACE_VERSION\d+",
+    r"STEAMMUSIC_INTERFACE_VERSION\d+",
+    r"STEAMMUSICREMOTE_INTERFACE_VERSION\d+",
+    r"STEAMHTMLSURFACE_INTERFACE_VERSION_\d+",
+    r"STEAMINVENTORY_INTERFACE_V\d+",
+    r"STEAMVIDEO_INTERFACE_V\d+",
+    r"SteamMasterServerUpdater\d+",
+]
+
+def findinterface(file_contents, interface_patt):
+    interface_regex = re.compile(interface_patt)
+    matches = interface_regex.findall(file_contents)
+    return matches
+
+def main():
+    if len(sys.argv) < 2:
+        print(f"usage: {sys.argv[0]} <path to steam_api .dll or .so>")
+        return 1
+
+    try:
+        with open(sys.argv[1], 'rb') as steam_api_file:
+            steam_api_contents = steam_api_file.read().decode('utf-8', errors='ignore')
+    except IOError:
+        print(f"Error opening file: {sys.argv[1]}")
+        return 1
+
+    if not steam_api_contents:
+        print("Error loading data")
+        return 1
+
+    interfaces = []
+    for pattern in interface_patterns:
+        interfaces += findinterface(steam_api_contents, pattern)
+    interfaces = sorted(set(interfaces))
+
+    if not interfaces:
+        print("No interfaces were found")
+        return 1
+
+    try:
+        with open("steam_interfaces.txt", "w") as out_file:
+            for interface in interfaces:
+                out_file.write(f"{interface}\n")
+    except IOError:
+        print("Error opening output file")
+        return 1
+
+if __name__ == "__main__":
+    sys.exit(main())