- removes redundant `if (df::global::ui)` checks; and tested to ensure no segfaults cropped up like in the past times I've removed these
- removes useless `if (pause_lock)` pause lock is set when plugin initializes, even if pause lock was left null (since we technically don't need it, and that was the point of the null check) it still would be a useless check (actually an impediment preventing functionality)
- removes disabled interpose code
- removes lua linkage
- updates doc
extra:
- surrounds user input for tick frequency with `std::abs()` not that we would have ended up with a negative value, but it was probably a typo and this is easier than printing an error or letting it underflow past max int (on most systems)
- Fixes for state transitions that were found broken. eg. plugin disabled -> enable auto-unpause feature -> enable plugin (auto-unpause will not truly be enabled; similar transitions were broken)
- Adds a commented out lock for if the pause code is ever adopted into the core API, as to enable many mods to use the `World::SetPauseState()` without walking over each other, and in the case of `reveal hell` also be able to avoid needing to set the state every tick in onupdate
- Revises the usage docs with `enable|disable|set` syntax