Conference-scheduler-cli

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* New Feature: Pre-allocated events can be defined in allocations.yaml

* Breaking Change: venues.yml renamed to timetable.yml

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* Breaking Change: content previously in separate yaml files now in venues.yaml

* New Feature: objective function argument added to build command

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* Improved logging with counts of events and slots by event type

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* New Feature: Venue availability can be defined

* Minor Improvement: Order of columns in schedule.csv swapped to show index
numbers at lhs of file

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* Bug Fix: Redundant export of schedule on rebuild removed

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* New feature: Rebuild command
Rebuild the output files from a previously computed schedule