fix: prevent pixman crashes and ensure valid color management metadata

[Watchdog0x]

Description

This PR addresses two related issues causing crashes in clients (specifically Chromium/Electron-based applications) due to invalid data being passed from the compositor.

Changes

1. Fix Invalid Pixman Rectangles (Monitor.cpp)

In CMonitor::addDamage(const CBox& box), a guard clause was added to ignore boxes with non-positive dimensions.
Previously, passing a box with width <= 0 or height <= 0 to pixman_region32_init_rect caused an assertion failure or crash with the error:
*** BUG *** In pixman_region32_init_rect: Invalid rectangle passed

2. Fix Incomplete Image Description (ColorManagement.cpp)

Updated CColorManagementImageDescriptionInfo and scRGB creation to ensure valid metadata is always sent to clients:

• Fallback Primaries: If primaries are invalid (e.g., zeroed out), the protocol now sends standard sRGB primaries instead of sending invalid data.
• scRGB Luminance: Hardcoded valid default luminance values (min: 0.0001, ref: 80, max: 600) for Windows scRGB generation to satisfy strict client validation.

Impact

This fixes crashes observed in applications logging:

• [wayland_wp_image_description.cc] Incomplete image description info from compositor
• pixman_region32_init_rect: Invalid rectangle passed

[github-actions]

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[Honkazel]

Welp...

[Watchdog0x]

This update adopts modern C++ standards (C++17/20/23) to strengthen the security and robustness of the Color Management protocol implementation through safer type manipulation.

It also introduces additional security features, such as applying const correctness to methods and variables to avoid unintended state changes.

[UjinT34]

Other CM changes are mostly some refactoring and code style changes that shouldn't affect how the proto works but might not match the rest of the codebase.

[Watchdog0x]

Don’t merge this. Code is a piece of shit (confirmed by bugs).