Release v1.0.0

This is the initial release for substrate.

Included in this release are:

• Utility headers for backporting C++14, 17 and some 20 features to older C++ versions;
• RAII wrappers for file descriptors, sockets, memory maps, PTYs (Linux only), and pipes;
• Type-safe formatted console IO interface with integrated log level system;
• Threading primitives such as a thread-safe queue, and thread pool implementation;
• OS-agnostic thread affinity helpers;
• Types for performing zip() on containers, iterating over a numerical range (indexSequence_t), and iterating over a container in the style of enumerate() (indexedIterator_t);
• Command line options representation and parser;
• Concurrency types for rwlocks, latches, barriers, and helpers for getting the current thread ID and number of CPUs available platform-agnostic;
• Bit manipulation helpers;
• Packed integer encoders/decoders such as for LEB128;
• Helpers for handling integer promotion problems;
• Implementations of hashing/checking algorithms such as murmur128 and CRC32;
• Types for representing packed boolean flags and bitwise flags fields;
• Types for implementing smart bitfields;
• Implementations of the cryptographic functions SHA256/512, and Twofish;
• Various PRNG implementations;