add 'source' context menu
move wrangler menu
fix debugger problem
gh168 - debugger: send source paths to int:i
remove debug printout
simplify ListUtils
autoremove semicolons after output dir config
convert 'indent' and 'toggle comment' to command handlers
adjust menu positions
when runtime dies/stops, remove it from manager
add Delegate annotation
Merge branch 'source_menu' into pu
improved locking for getting ide backend
fix unsynchronized access to backend manager
1344 - builder: limit number of parallel compiles
1307 - better parse record definitions with type specs
rename editor tab width preference to 'indent width' and make read-only

the old pref was confusing and useless. We need to decide the indentation
step, but the details require refectoring the whole indent code.
prepare v0.28.0
v0.28.0
v0.28.0