I've reorganized the repository, added tests, and updated the documen…

[JacobBorden]

…tation.

Here's a summary of the major changes:

• I reorganized the file structure by moving bitmap.h and bitmap.cpp to src/bitmap/ and integrating the matrix and bitmapfile modules directly into src/.
• I added comprehensive unit tests for the Bitmap::File module (in src/bitmapfile) and the Matrix module (in src/matrix).
• I refactored the Matrix class by implementing correct copy/move semantics (Rule of Five), fixing operator signatures and behaviors, and adding missing constructors and utility methods (for example, for 0x0 matrices).
• I fixed bugs in Bitmap::File, including correcting the handling of pixel data padding in the Open() and Save() methods and ensuring biSizeImage is calculated and used correctly.
• I updated the documentation: README.md now reflects the new structure and module locations, and CHANGELOG.md details the reorganization and new additions.
• I ensured all CMakeLists.txt files are updated for the new structure.

All 59 unit tests are passing after these changes.