Upgrading the files for a cross-platform package

[aeldably]

No description provided.

[cyberjunk]

@Ahmed-Eldably

Code changes are fine in Matlab 2020a on Windows.
But it complains about missing liblsl:

Could not locate the file "lsl.dll" on your computer. Attempting to download...
See https://github.com/labstreaminglayer/liblsl-Matlab/#troubleshooting for further troubleshooting tips
See https://github.com/labstreaminglayer/liblsl-Matlab/#troubleshooting for further troubleshooting tips
See https://github.com/labstreaminglayer/liblsl-Matlab/#troubleshooting for further troubleshooting tips
Error using lsl_loadlib (line 47)
Invalid default value for property 'lib' in class 'lsl':
Error loading the liblsl library: Undefined function 'lsl_loadlib_' for input arguments of type 'char'. Make sure liblsl-Matlab/bin is added to path and
try running build_mex.m

Error in main (line 29)
mylsl            = lsl();

It downloads the lsl.dll but I have to additionally put all the .mexw64 back into the liblsl-Matlab/bin folder. I tried running build_mex.m but that didn't do anything.

Can we please continue to provide a precompiled liblsl inside the repo? Preferrably for Windows (X64) and macOS (UNIVERSAL2) ?