Group GM*.cpp/h into src/source/GameMaps/ (#344)

[Mosch0512]

Summary

• Move all 26 per-map gameplay .cpp files (and their 27 headers, including the standalone GMGmArea.h and GM_Kanturu_1st.h) into src/source/GameMaps/
• Update the 27 #include lines in w_MapHeaders.h to use the new GameMaps/ prefix (matching the existing convention used for Camera/, Scenes/, etc.)
• No CMake changes needed: src/CMakeLists.txt:86-89 uses file(GLOB_RECURSE source/*.cpp), so the new subfolder is picked up automatically

First incremental subsystem grouping under sven-n#344.

w_MapHeaders.h is the only file that referenced these headers without a folder prefix; every GM*.cpp includes its own GM*.h (resolved via same-dir lookup, still works after the move).

Test plan

• MinGW build (Unix Makefiles + mingw-w64-i686.cmake toolchain) of Main target succeeds
• Object files compile from new path (src/CMakeFiles/Main.dir/source/GameMaps/GMAida.cpp.obj etc.)
• Main.exe links successfully
• MSVC build (not run locally)

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request performs a structural cleanup by grouping map-related source files into a specific subdirectory. This change aligns the codebase with established conventions used for other subsystems and enhances maintainability without requiring modifications to the existing CMake configuration.

Highlights

• Project Structure Refactoring: Moved 26 gameplay map source files and their corresponding headers into a dedicated 'src/source/GameMaps/' directory to improve project organization.
• Header Inclusion Updates: Updated all 27 include directives in 'w_MapHeaders.h' to reflect the new directory structure, ensuring compatibility with the existing build system.

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[gemini-code-assist]

Code Review

This pull request relocates several game map header files into a GameMaps subdirectory and updates the include paths in w_MapHeaders.h accordingly. The review feedback identifies a case sensitivity mismatch between the GM_Kanturu_1st header and implementation files that may break builds on case-sensitive filesystems. Additionally, it is recommended to add a trailing newline to w_MapHeaders.h to adhere to C++ standards.

[gemini-code-assist]

There is a case inconsistency between the header file GM_Kanturu_1st.h (uppercase 'K') and its implementation file GM_kanturu_1st.cpp (lowercase 'k'). While this may work on case-insensitive filesystems (like Windows), it can lead to build failures on case-sensitive systems (like Linux). Since these files are being moved as part of this PR, it is a good opportunity to rename GM_kanturu_1st.cpp to GM_Kanturu_1st.cpp to ensure consistency with the header and other related files (e.g., GM_Kanturu_2nd.cpp).

[gemini-code-assist]

The file w_MapHeaders.h is missing a newline character at the end. According to the C++ standard (e.g., C++11 §2.2/2), a non-empty source file should end with a newline. This is a best practice that prevents potential compilation warnings and issues with certain build tools or when concatenating files. Since you are already modifying this line, it's a good opportunity to add the missing newline.

Suggested change

	#include "GameMaps/GM3rdChangeUp.h"
	#include "GameMaps/GM3rdChangeUp.h"