new module: md5 with substitution

[nick8606]

"OpenCL/m00000_a3-pure.cl" will be enough for your task.

At first, read and understand "docs/hashcat-plugin-development-guide.md".

Source code is relatively short, replacement must be done before

Code:

md5_update_vector (&ctx, w, pw_len);

Pay attention: type of 2nd parameter is array of dwords (not string or array of bytes).