Fixing Linux build and missing file (gitignore...)
Made the test longer to enable valgrind profile
Using a LUT table for gain handling. Still need to add the linear interpolation if possible (long calculation ahead...)
Added a LUT for the gain stage and fixed its behavior (don't multiply by the input, this is done by apply gain instead).
Fixed the input/output pointer filters tests + improved perf
Cached the array pointers (should do the same for the other filters as well)
Added restrict support
Fixing Python wrappers