fix: more adjustments fixes

- expansion is prettier (hides the summarized args and retvalues)
- refactored local control lambdas into similar scheme as remote
  fetchers
- recovered lost `slime-trace-dialog-refresh' macro
- added `slime-trace-dialog-next' and `slime-trace-dialog-prev'
add: still broken, but idea for toggling "brief mode"
add: inspect trace parts in the inspector