Make k unsigned.

Clean up the x-mas tree

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

- add option `strided_index` for each gpu

Fix for AMD GPU detection on MacOS X
On MacOS X the platform is reported as Apple, and the vendor is reported as AMD.

The max work size shown to the user was the hardware maximum but not take in account thet some kernel spwning 8 times more threads per work group than configured by the user.

- handle opencl errors to avoid unexpected behaviors
- remove code duplicatio nwithin the some method

- enforce that only host side OpenCl 1.2 functions are used if the miner is compiled with `XMR-STAK_COMPILE=generic`
- update documentation
- add CMake option `XMR-STAK_COMPILE` to windows

Remove whitespace lines

- removed all space indention in `*.hpp` and `*.cpp` files

- rename all `xmr` to `monero`
- be insensitive while check for set currency
- add function to compate two strings insensitive

- add compile parameter to support aeon and xmr
- update auto suggestion to handle aeon

- remove 32bit target value
- use always 64bit target for amd backend

fix bug announced in #52

If the miner is compiled in debug mode the assert condition results in a compile time error.

Is is possible that the number of results are greater than the result output array,
in this case invalid memory can be access within the device and on the host side.

check that the number of global threads is a multiple of the workgroup size

The number of threads within a kernel must be a multiple of the worksize.
If not it can crash on some systems.

- 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`

- inlcude opencl source code during compile

- fix broken windows support

- add backend
- add auto suggestion