Enhance CLI command structure and add new functionalities

- Refactored existing CLI commands to follow a more structured naming convention, improving clarity and usability.
- Introduced new commands for dungeon and graphics handling, including `dungeon export`, `gfx export-sheet`, and `gfx import-sheet`, with placeholder implementations.
- Added palette export and import commands, enhancing the CLI's capabilities for managing graphical assets.
- Updated usage examples and help text to reflect the new command structure and improve user guidance.
- Incremented version number in TUI components to reflect the latest changes.

src/cli/handlers/gfx.cc

@@ -0,0 +1,29 @@
+#include "cli/z3ed.h"
+
+namespace yaze {
+namespace cli {
+
+absl::Status GfxExport::Run(const std::vector<std::string>& arg_vec) {
+  if (arg_vec.size() < 2) {
+    return absl::InvalidArgumentError("Usage: gfx export-sheet <sheet_id> --to <file>");
+  }
+
+  // TODO: Implement gfx export logic
+  std::cout << "Gfx export not yet implemented." << std::endl;
+
+  return absl::OkStatus();
+}
+
+absl::Status GfxImport::Run(const std::vector<std::string>& arg_vec) {
+  if (arg_vec.size() < 2) {
+    return absl::InvalidArgumentError("Usage: gfx import-sheet <sheet_id> --from <file>");
+  }
+
+  // TODO: Implement gfx import logic
+  std::cout << "Gfx import not yet implemented." << std::endl;
+
+  return absl::OkStatus();
+}
+
+} // namespace cli
+} // namespace yaze