CRAB: Fix FPS being shown unnecessarily.

[Brakkugit]

Now fps is only shown if the user types "draw fps" in debugger console.

[coderabbitai]

Walkthrough

Walkthrough

The changes across the files indicate an update to the Crab engine, introducing the ability to toggle the display of frames per second (FPS) during debugging. A new debug draw flag DRAW_FPS has been added, and the console now recognizes an "FPS" parameter to enable this feature. The application's run function has been modified to check this flag before drawing FPS information on the screen.

Changes

File(s)	Change Summary
.../crab/app.cpp	Modified to conditionally draw FPS based on a new debug setting.
.../crab/console.cpp	Updated to handle "FPS" parameter, enabling FPS information display for debugging.
.../crab/crab.h	Added DRAW_FPS flag to DebugDraw enum to support new FPS drawing feature.

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