* parse process output for shell prompts with current directory
* parse `make -w -C` output for temporary subdirectory excursions
* handle property type and flags separately
* add `QE_PROP_MARK` to prevent offset update at range boundary
* use `QE_PROP_DUP` to optimize buffer properties with single allocation
* use mask in `eb_delete_properties` to delete tags selectively
* fix `eb_find_property` range glitch
* fix offset tracking for CWD properties
* simplify default directory selection for shell commands
* fix compiler warnings on variable shadow definitions
* optimize `next_error()`: no lookback needed anymore
* display buffer properties in `describe-buffer`
* update TODO.md
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