v0.2.0 to main

[arbCoding]

Originally my goal was only to migrate from using Make to using CMake. Then I got inspired and rewrote a large chunk of the sac-format library.

Major changes from v0.1.0:

• namespace is now sacfmt
• SacStream is now Trace
• Parameters are no longer directly accessible, now you must use the setters and getters. (e.g., instead of trace.npts, use trace.npts(), or trace.npts = 10 becomes trace.npts(10))
• Parameters are now stored in private arrays and getters/setters access via a look-up table using class enumaration (much safer against coding errors)
• Added trace comparison functionality
• Now uses CMake
• Documentation on github.io and as a pdf
• Migrated from markdown to org for consistent text generation
• Unit-testing with Catch2
• Benchmarking with Catch2
• Added an example program
• Compiles as a statically linked library to simplify usage
• And generally cleaner code through linting.

Cheers!