Add advanced tests

[nchapman]

Added tests that need mocks and integration tests. This involves a lot of refactoring to make the code more testable. During review we need to be extra mindful of not regressing any features.

[Copilot]

Pull Request Overview

This PR significantly improves MinUI's codebase architecture by extracting logic from monolithic files into reusable, testable modules. The main focus is on improving testability by separating pure logic from SDL/platform dependencies and adding comprehensive unit test coverage.

Key Changes:

• Extracted data structures (Array, Hash) from minui.c to collections.c for reusability
• Separated input handling logic (PAD_*) from api.c to pad.c for isolated testing
• Moved text rendering utilities (GFX_*) from api.c to gfx_text.c
• Created parsers for various file formats (M3U, map.txt, recent.txt, collections)
• Added path generation utilities and binary file I/O helpers
• Implemented comprehensive unit tests with mocking support (fff framework, file system mocks)
• Updated makefiles to include new source files in builds

Reviewed Changes

Copilot reviewed 63 out of 66 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
workspace/all/common/collections.{c,h}	Extracted Array and Hash data structures for reusability
workspace/all/common/pad.{c,h}	Separated input state management from SDL dependencies
workspace/all/common/gfx_text.{c,h}	Extracted text rendering utilities for testing
workspace/all/common/*_parser.{c,h}	New parsers for M3U, map.txt, collections, recent.txt files
workspace/all/common/minui_*.{c,h}	Helper utilities and file checking functions
workspace/all/common/minarch_paths.{c,h}	Path generation for save files
workspace/all/common/audio_resampler.{c,h}	Audio resampling algorithm extraction
workspace/all/common/binary_file_utils.{c,h}	Binary file I/O utilities
workspace/all/common/api.c	Removed extracted code, added includes for new modules
workspace/all/minui/minui.c	Removed data structures now in collections.c
workspace/all/*/makefile	Updated to include new source files in compilation
tests/unit/all/common/test_*.c	Comprehensive unit tests for all new modules
tests/support/*	Testing infrastructure (SDL stubs, fakes, mocks)
tests/integration/integration_support.{c,h}	Support utilities for integration tests
makefile*	Documentation improvements and qa target fix

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