Fix Release for v3.4

v3.4.3

Fixes

• Changed shift parameter type from unsigned type to signed type to enable usage of negative offsets. Shift was incorrectly using unsigned offset parameter earlier.
• Fixed Rust String to CString conversion in image loading/saving functions.
• Fixes/Changes in the documentation for following functions:
  • Array::copy and Clone trait implementation for Array
  • Add note to std::ops traits implementation explicitly stating they carry out element wise operations.
  • Corrected documentation dot that it accepts only vector/scalar arrays.
• Added more search locations for build.rs script to look for ArrayFire libraries.