- changes report* lookup in `NewReportEvent()`
- adds a nullptr check
- adds df::coord bound checking in various places
- where the `get_*neighbours()` functions are used
- `simulate_fall()`
- `is_safe_to_dig_down()` and `is_safe_fall()`
- adds nullptr checks to the `is_*job()` functions
- added todo comments for `is_safe_to_dig_down()`
- Updates rst documentation
- Adds troubleshooting section
- Renames the monitor feature to monitoring
- Adds cave-in helper functions
- ChannelJobs::has_cavein_conditions()
- ChannelJobs::possible_cavein()
- find_dwarf() ~ finds the nearest dwarf or the first one that has a path to a position
- Moves dignow/resurrect to inlines.h
- Improves management of regular dig designations
- Adds df::job* tracking back into ChannelJobs to simplify cancellations
- Updates/improves debug logging
- Switches unordered structures with ordered in some locations to have ordered debugging information
- Simplifies ChannelManager::manage_group()
- Fixes up ChannelManager::manage_one()
- the return value is now useful even if unused