Add support of armeabi-v7a architecture

[dmitvitalii]

• Support armeabi-v7a CPUs
• Use different libs for different architectures, choose from directories
• Fix an issue with hashrate: show middle value if max value is not available.

[bobbieltd]

Great thank you. Does it support Monero v7 ?

[dmitvitalii]

In this library the "cryptonight" algorithm is hardcoded.

If xmrig supports V7 (as far as I understood they do), the MoneroMiner can be fixed that way, but I didn't test it.

[bobbieltd]

If you compile new xmrig , it will switch and mine Monero v7 automatically (“algo” is till “cryptonight”, hard coded is not problem).

[bobbieltd]

I can not disable donation with your 32 bit xmrig.

[dmitvitalii]

They are disabled by default: config.json