pmt: The basis of the system for adding features was created and improvements were made.

- The basic header contents of the system, designed to easily add features, were written.
 - The [CLI11](https://github.com/CLIUtils/CLI11) project was included to provide a better experience for the project.
 - Improved logging system.
 - Unnecessary code cleaned.

src/functions/functions.hpp

@@ -0,0 +1,66 @@
+/*
+   Copyright 2025 Yağız Zengin
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+#define NEED_BASIC_FUNCTION_CLASSES
+#include <libpmt/lib.hpp>
+
+namespace PartitionManager {
+
+// Back-up function
+class backupFunction : public PartitionManager::FunctionBase {
+private:
+	CLI::App* _cmd = nullptr;
+
+public:
+	bool init(CLI::App& _app) override;
+	bool run() override;
+	const char* name() override;
+};
+
+// Image flasher function
+class flashFunction : public PartitionManager::FunctionBase {
+private:
+	CLI::App* _cmd = nullptr;
+
+public:
+	bool init(CLI::App& _app) override;
+	bool run() override;
+	const char* name() override;
+};
+
+// Eraser function (only the partition content is cleared)
+class eraseFunction : public PartitionManager::FunctionBase {
+private:
+	CLI::App* _cmd = nullptr;
+
+public:
+	bool init(CLI::App& _app) override;
+	bool run() override;
+	const char* name() override;
+};
+
+// Partition size getter function
+class partitionSizeFunction : public PartitionManager::FunctionBase {
+private:
+	CLI::App* _cmd = nullptr;
+
+public:
+	bool init(CLI::App& _app) override;
+	bool run() override;
+	const char* name() override;
+};
+
+} // namespace PartitionManager