Added scroll wheel to zoom in / out - since some apps require that feature

[brantpastore]

Added togglable
This pull request introduces a new on-screen overlay UI for debugging, adds a configurable mouse wheel action (scroll vs. pinch-to-zoom), and exposes new command-line options to control these features. The changes span CLI argument parsing, display rendering, input handling, and screen state management.

Overlay UI and Debugging Features:

• Added a persistent on-screen overlay for debugging, including checkboxes (e.g., "Pinch Zoom on Scroll", "Overlay Toggle") and an info line, rendered directly in sc_render_overlay_ui in display.c. Overlay state and position are managed in struct sc_display and struct sc_screen. [1] [2] [3]
• Introduced the --overlay CLI flag to keep the debug overlay visible, with corresponding option parsing and propagation to runtime structures. [1] [2] [3] [4] [5] [6]

Mouse Wheel Action Customization:

• Added a --scroll-action CLI option to choose between normal scrolling or sending pinch-to-zoom keycodes for mouse wheel events. This is parsed and stored in the new enum sc_scroll_action and propagated through options and input manager structures. [1] [2] [3] [4] [5] [6] [7] [8] [9]

Display and Input Handling Enhancements:

• Extended struct sc_display and struct sc_input_manager to track overlay and scroll action state, and updated the display rendering pipeline to draw the overlay when enabled. [1] [2] [3] [4] [5]
• Updated screen rendering and initialization logic to manage overlay visibility, position, and state transitions, including support for temporary overlays and TTL-based hiding. [1] [2]

Command-line Interface and Defaults:

• Added new option constants, parsing logic, and default values for overlay and scroll action features in cli.c and options.c. [1] [2] [3] [4] [5]

These changes lay the groundwork for more interactive debugging and user customization of input behavior.

• Overlay UI and persistent overlay option: [1] [2] [3] [4] [5]
• Mouse wheel scroll/zoom action customization: [1] [2] [3] [4] [5] [6] [7] [8]
• Display and input manager structure updates: [1] [2] [3] [4] [5]
• Screen rendering and overlay state management: [1] [2]
• CLI option parsing and defaults: [1] [2] [3] [4] [5]moveable window that enables scroll to zoom in / out. Added scroll to zoom in / out - since some apps require that feature. Added debugging output around motion events.