Win7 API level support

Added AWS_SUPPORT_WIN7, Win7 is no longer supported by default (#669)

* Added AWS_SUPPORT_WIN7, Win7 is no longer supported by default

* Added AWS_SUPPORT_WIN7 macro for feature detection

Bytebuf updates

• Added some new aws_byte_buf APIs - functions for securely (zero all released memory) appending both cursors and single bytes.
• Removed aws_bigint; it is no longer needed.

Bigint constant time updates

• Reworks certain bigint constructors and operators to constant time

Added support for BOM/text encoding detection

v0.4.46

Added BOM detection/encoding detection via aws_text_encoding_detect (…

Added support for MSVC static CRT linkage

v0.4.45

Doc update for STATIC_CRT (#644)

AWS versions of isspace(), isalpha(), etc.

aws versions of isspace() isalpha() etc (#642)

Versions of isspace() isalpha() etc for use with ASCII/UTF-8.
C's built-in functions are affected by user's locale.

Added newline to a test file that was breaking builds.

Added newline to process_test.c (#641)

* Added newline to process_test.c

Updated Process API to expose max fds for the system.

IO handle ulimit stuff. (#637)

API for reading max fds and updating the soft limit.

SBA fix for windows, warning fixes for ctz math fallbacks

Windows compilation fixes (#631)

* Use _WIN32 consistently, no WIN32

* Use signed compare in fallback ctz implementations

* Added cross compile CI

* Don't build consumers for cross compile, they're not all guaranteed to work

* Use builder version v0.6.4

Small Block Allocator support

Add utility to append null terminator to aws_byte_buf.

Co-authored-by: Andrew Tang <[email protected]>