Price-time Priority Exchange + CSV writing implementation

[ltanak]

Price-time Priority Exchange

• implemented a price-time priority exchange using a price-level window structure
• add and remove operations are amortised O(1)
• orderbook supports recentering around price
• currently fixed tick size of 0.01 (to represent prices such as 123.45)

CSV Writing

• implemented the collection of results for exchange outputs

Further features

• more verbose scripting, allowing for tools such as valgrind, perf, gdb, etc

Fixes

• removed thread contention on incrementing size variable

[ltanak]

Currently SSH server is down so unable to make progress - will fix tests once it is back up (I had to refactor lots of the structs, which is why they are failing)

[Archii0]

Had a quick skim through, things look pretty good.

Just remember to add new lines at the end of the files (nitpick).