1584 simplifications

[pmconrad]

1st round of simplifications. Removed lots of stuff. The result is still compatible with current core.

Sorry about the mess in the 1st commit. I had it separated into many nice and clean commits, then destroyed my .git folder. :-/ Note to self: never use find | xargs sed -i in top-level project dir.

Highlights in 1st commit:

• Replaced fc::any with boost::any
• Replaced fc::min with std::min
• Replaced fc::move with std::move
• Replaced fc::string with std::string (core still uses fc::string so can't remove the typedef yet)
• Replaced fc::aligned<> with alignas
• Replaced fc::remove_reference with std::remove_reference
• Replaced fc_swap with std::swap

The last change is to remove the openssl-based ECC implementation, which is slow and disabled by default. See discussion in bitshares/bitshares-core#1584

More to follow, but that will require changes in core as well, so I wanted to get this in now.

[jmjatlanta]

Small items for Windows and Mac. The increase in tcp_socket.hpp line 54 is interesting. You may know more about it than I do. As I see there was a similar problem in file_mapping.hpp.

Another consideration: CMakeModules/FindBOOST.cmake is broken on macOS and Windows. Would you consider removing it as part of your cleanup? Things build fine without it on those platforms, and probably Linux as well (haven't tried yet).

[pmconrad]

I think the reason for the problems with fwd<...> is the replacement of fc::aligned with alignas.
Apparently a union (which is what backed fc::aligned) can be larger than its largest element when alignment comes into play. This means the constants have always been too small, only it was never noticed because the backing union was large enough.

[pmconrad]

Tried to remove FindBoost, but ran into a linker error concerning libpthread. See discussion in #121 .

[jmjatlanta]

Tried to remove FindBoost, but ran into a linker error concerning libpthread. See discussion in #121 .

I guess my dream will have to wait, then. :-) Now compiles on macOS and Windows. I am now working on a more thorough review.

[jmjatlanta]

Excellent job. Tested on Ubuntu 19.04 / Boost 1.67 / BitShares develop branch. Tests in FC and core/chain_test run with no errors detected. Code looks clean.

Concerns addressed

[jmjatlanta]

Excellent job. Tested on Ubuntu 19.04 / Boost 1.67 / BitShares develop branch. Tests in FC and core/chain_test run with no errors detected. Code looks clean.

[jmjatlanta]

Question for my own education: The uncommenting of deque pack and unpack... Everything compiles if this remained commented out. Would the raw pack/unpack have taken over?

[pmconrad]

They were previously in fc/container/deque_fwd.hpp, which I deleted. Didn't test compilation with removing them completely.