Document vram_mgr

[dogo]

Summary

Added Doxygen documentation to vram_mgr.h, covering all macros, global variables, and functions related to VRAM management in OSLib.

Key Points

• Macros: Documented OSL_VRAM_SIZE, OSL_VRAM_BASE, and OSL_VRAM_END.
• Global Variables: Added descriptions for osl_useVramManager and osl_currentVramPtr.
• Functions:
  • oslVramMgrInit(): Initializes the VRAM manager.
  • oslVramMgrAllocBlock(int blockSize): Allocates a block of VRAM.
  • oslVramMgrFreeBlock(void *blockAddress, int blockSize): Frees a VRAM block.
  • oslVramMgrSetParameters(void *adrStart, int size): Configures VRAM parameters.

This improves code clarity and aids future maintenance.