- allow the dev pool to fork on a different block version than the user descriped coin

All algorithm are centered around the user coin description.
It is allowed to have two two different coin algorithms in the user coin description.
It is only allowed to use algorithms for the dev pool coin description those are used in the user coin description.
There are two ways to define a non forking coin.
  - set both user coin algorithm descriptions to the same algorithm and set version to zero
  - set the first algorithm in the user coin description to something you like to use in the dev pool
    and set the second algorithm to the correct representation of the coin. Set the version to 255.
    This will allow that the dev pool can mine on a different coin algorithm than the not forking user coin.
    Do not use an algorithm with different scratchpad size for the dev pool.

In the case where the dev pool mines on a higher version than a monero fork coin the miner is not resetting the algorithm.
This PR select the correct algorithm each time the block version hash changed.

- add CLI flag to explicitly use non AMD OpenCL and devices
- adjust OpenCL output (use OpenCL instead of AMD if --altOpenCL is sued)
- optimize NVIDIA OpenCL auto suggestion

- fix conversion from large type tp small

avoid conversion warning by reducing the size value type

Use the maximum scratchpad size from before and after the fork.

- remove version numbers within the kernel
- create seperate program context for each mining algorithm
- remove kernel `cn1_monero` is now integrated in `cn1`
- remname `cnX` kernel in `cnX + algorithmNumber`

sumokoin is broken if `bfactor >= 5` is used (default for windows)
sumokoin for `sm_20` is broken due to the missing extern shared memory

- call phase3 kernel two times if sumokoin is enabled
- create extern shared memory for phase3 kernel

fix #1297

If sm_20 is mixed with other architectures the detection for the minimal supported architecture is broken.

- fix that version argument was not passed to extended kernel parameters

-rename `mining_fork_height` to `*_version`

- add `fork_height` to currency
- refactor algorithm selection

fix #1218

- remove inline function with ugly macro :-(

- documentation: change `aeon` to `aeon7`
- change `case` order in `switch` statements
- update README.txt

allow to disable the OpenCl cache
  - usefull for read only systems
  - usefull for unknown errors during cache reading

fix warning

```
/Users/user/xmr-stak/xmrstak/backend/amd/amd_gpu/gpu.cpp:481:11: warning: using the result of an assignment as a condition without parentheses [-Wparentheses]
                if( ret = clGetProgramInfo(ctx->Program, CL_PROGRAM_BINARIES, num_devices * sizeof(char*), all_programs.data(),NULL) != CL_SUCCESS)
```

- add new pow for AEON
- fix missing cryptonight-heavy selection for multi hashes

- remove call `IsCurrencyMonero` with `cn_select_memory`

revert #1198, the block size is limited to 84byte

change warning when precompiled OpenCL code is not found

Co-authored-by: psychocrypt <psychocryptHPC@gmail.com>
Co-authored-by: fireice-uk <fireice-uk@users.noreply.github.com>
Co-authored-by: Lee Clagett <code@leeclagett.com>
Co-authored-by: curie-kief <curie-kief@users.noreply.github.com>

A redefinition of a variable in a local scope avoid that the intensity is rounded to a multiple of the work size.

Reduce OpenCL start time by using a self made compiler cache.

- store compiled OpenCL binary
- load OpenCl binary if available

- reduce startup time for multi gpu systems
- initialize the GPU memory non concurrent

fix double definition of define `MEM_CHUNK`

guard error types those are only defined in OpenCL >1.1

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

allow usage of Mesa OpenCl

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

reduce usage of registers: based on the suggestion of @enerc77

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.

fix that the GPU name is printed before the name is querried from OpenCL

- enable L1 cache for Nvidia Volta GPUs and newer
- remove explicit cache controll for Volta GPU and newer

This pull request increases the hash rate for Volta GPUs by ~5%