fix naming to resolve coroutines conflict with regular functions

Author: ruslan-ilesik

include/dpp/cluster.h

@@ -477,7 +477,7 @@ class DPP_EXPORT cluster {
 	 * @return bool Returns `true` if the command was registered successfully, or `false` if
 	 * the command with the same name already exists
 	 */
-	bool register_command(const std::string& name, const slashcommand_handler_t& handler);
+	bool register_command(const std::string& name, const slashcommand_handler_t handler);
 
 #ifdef DPP_CORO
 	/**
@@ -489,7 +489,7 @@ class DPP_EXPORT cluster {
 	 * @return bool Returns `true` if the command was registered successfully, or `false` if
 	 * the command with the same name already exists.
 	 */
-	bool register_command(const std::string& name, const co_slashcommand_handler_t& handler);
+	bool co_register_command(const std::string& name, const co_slashcommand_handler_t handler);
 #endif
 
 	/**

src/dpp/cluster.cpp

@@ -499,7 +499,7 @@ cluster& cluster::set_request_timeout(uint16_t timeout) {
 	return *this;
 }
 
-bool cluster::register_command(const std::string &name, const slashcommand_handler_t& handler) {
+bool cluster::register_command(const std::string &name, const slashcommand_handler_t handler) {
 	std::unique_lock lk(named_commands_mutex);
 	if (named_commands.count(name) != 0) {
 		return false;
@@ -509,7 +509,7 @@ bool cluster::register_command(const std::string &name, const slashcommand_handl
 }
 
 #ifdef DPP_CORO
-bool cluster::register_command(const std::string& name, const co_slashcommand_handler_t& handler) {
+bool cluster::co_register_command(const std::string& name, const co_slashcommand_handler_t handler) {
 	std::unique_lock lk(named_commands_mutex);
 	if (named_commands.count(name) != 0) {
 		return false;