Renames and restructures VGA timing generator for clarity and modularity.
Introduces VGA modes package for centralized resolution and timing configuration.
Updates related testbenches and constraints to align with new structure.
Improves maintainability and flexibility for future VGA mode additions.
Replaces separate VGA Red, Green, and Blue output signals with a unified 8-bit VGA pixel bus for improved signal management.
Updates signal mapping, testbench, and constraints file to reflect the new structure.
Enhances maintainability and reduces signal complexity.
