FluidX3D v3.5 upgrade: multi-GPU particles

Version bump to v3.4

.vtk export now converts and writes data in chunks, to reduce memory …

…footprint and time for large memory allocation

Implemented ~20x faster GPU-accelerated force/torque summation, simpl…

…ified calculating object force/torque in setups, improved coloring in VIS_FIELD/ray_grid_traverse_sum()

Workaround for Intel CPU compiler bug that causes rendering corruptio…

…n, updated OpenCL headers, better OpenCL device specs detection, added multi-GPU performance chart in Readme, updated driver install guides

FluidX3D v3.0 upgrade

Added splines for camera movement, fixed threading conflict with writ…

…e_frame(), more accurate runtime estimation, enabled FP16S by default

Updated Readme

Domain resolution is now unlimited with 64-bit indexing when needed, …

…added new raytracing-based field visulaization

Fixed terrible performance on ARM GPUs by macro-replacing fused-multi…

…ply-add (fma) with a*b+c