- use optimzed div and sqrt
- reduce memory footprint

- fix code style issues
- fix spelling issue
- fix asm to support newer clang versions

add option `unroll` for OpenCL to allow better tuning the main POW kernel.

There is a copy past mistake tha tthe type of the variable `memChunk` is not tested.

- add new option `comp_mode` to the amd config
- disable `if guards` within opencl kernel if `comp_mode : false`

- add new option for `strided_index`
- add additional option if `strided_index == 2` to controll the memory chunk with

The AMD jconf.cpp would only accept an array. The config sample, and the nvidia and cpu config work with the value 'null', as they accept a 'kNullType'. This means at current, AMD GPUs could not be turned off, the config file wouldn't parse on load.

This change makes AMD consistent with the others, and can now be disabled.

Allow to change the indexing used to address the hash scratchpad memory.

- add option `strided_index` for each gpu

- add clang compile section
- cleanup CMake file
- fix missing return value

- move source code to `src`
- categorize files and move to group folder
- change upper case class files to lower case
- change C++ header to `*.hpp`

- add backend
- add auto suggestion