Add /client cleardenied to clear list of denied texture pack URLs.

Since multiple times run into issues where someone accidentally denied a texture pack, and it's not obvious how to undo that, especially when you're using the web client.

src/Chat.c

@@ -429,6 +429,19 @@ static struct ChatCommand ModelCommand = {
 	}
 };
 
+static void ClearDeniedCommand_Execute(const String* args, int argsCount) {
+	int count = TextureCache_ClearDenied();
+	Chat_Add1("Removed &e%i &fdenied texture pack URLs.", &count);
+}
+
+static struct ChatCommand ClearDeniedCommand = {
+	"ClearDenied", ClearDeniedCommand_Execute, false,
+	{
+		"&a/client cleardenied",
+		"&eClears the list of texture pack URLs you have denied",
+	}
+};
+
 
 /*########################################################################################################################*
 *-------------------------------------------------------CuboidCommand-----------------------------------------------------*
@@ -589,6 +602,7 @@ static void Chat_Init(void) {
 	Commands_Register(&ModelCommand);
 	Commands_Register(&CuboidCommand);
 	Commands_Register(&TeleportCommand);
+	Commands_Register(&ClearDeniedCommand);
 
 	Chat_Logging = Options_GetBool(OPT_CHAT_LOGGING, true);
 }

src/TexturePack.c

@@ -536,6 +536,13 @@ void TextureCache_Deny(const String* url)        {
 	EntryList_Save(&deniedList);
 }
 
+int TextureCache_ClearDenied(void) {
+	int count = deniedList.entries.count;
+	StringsBuffer_Clear(&deniedList.entries);
+	EntryList_Save(&deniedList);
+	return count;
+}
+
 CC_INLINE static void TextureCache_HashUrl(String* key, const String* url) {
 	String_AppendUInt32(key, Utils_CRC32((const cc_uint8*)url->buffer, url->length));
 }

src/TexturePack.h

@@ -82,6 +82,8 @@ void TextureCache_Accept(const String* url);
 /* Adds the given URL to list of denied URLs, then saves it. */
 /* Denied URLs are never loaded. */
 void TextureCache_Deny(const String* url);
+/* Clears the list of denied URLs, returning number removed. */
+int TextureCache_ClearDenied(void);
 
 /* Returns whether the given URL has been cached. */
 cc_bool TextureCache_Has(const String* url);