Fix Scilab 2025.1.0 compatibility: Update deprecated scicos_block4.h header

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This PR fixes the compatibility issue with Scilab 2025.1.0 where the SciPowerLab toolbox would crash when running demos. The root cause was the use of the deprecated scicos_block4.h header file, which was replaced with scicos_block.h in newer Scilab versions.

Changes Made

Updated C computational functions:

• Replaced #include "scicos_block4.h" with #include "scicos_block.h" in all 7 computational function files:
  • xcpl_BLDC_comp.c - Brushless DC Machine
  • xcpl_BLSC_comp.c - Brushless DC Machine Controller
  • xcpl_PMSM_comp.c - Permanent Magnet Synchronous Machine
  • xcpl_PMSC_comp.c - PMSM FOC Controller
  • xcpl_IMPU_comp.c - Induction Machine Per-Unit Model
  • xcpl_SVPWM_comp.c - Space Vector PWM Generator
  • xcpl_PSDINV_comp.c - Pseudo Inverter

Version and documentation updates:

• Bumped version from 0.4 to 0.5 in DESCRIPTION and README.md
• Added changelog entry documenting the Scilab 2025.1.0 compatibility fix
• Updated release date to reflect the current fix

Testing

The toolbox should now work correctly with Scilab 2025.1.0. Users can verify the fix by:

1. Running exec builder.sce to build the toolbox
2. Running exec loader.sce to load the toolbox
3. Testing with the PMSM FOC demo: exec demos/demPMSM.dem.sce

The fix maintains backward compatibility with earlier Scilab versions while resolving the crash issue in 2025.1.0.

Fixes #1.

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