Better cache dir initialization in script

Makes the script work with both tempname and mktemp; switches to fsnotify

Adds -1 (no-daemon) mode & generifies file suffix (although, _a_ suffix is still required

synctodo script has fewer bugs.

Updated changelog and added some info about synctodo to the README

synctodo didn't preserve versions of the ultimately merged file; it does now

Add synctodo script to manage sync-conflict files

When merging tasks, remove duplicate project and context tags

Update key signing hash

Add build status, links to tracker & binaries

Add CI

Add version & help

Add credits

Initial commit
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More future