doc: create specific uninstall sections

move recipes from "Good Things to Know"
add devscript list_recent_pkg_ids

Another way to get pkg ids -- which recent installs are most recent.
update ios-screensaver for artifact screen_saver
make version number available within brew-cask

brew cask doctor was showing 1.8.7 as the homebrew-cask software version
example external commands
initial presstube screensavers
updated shotcut
Merge pull request #2707 from vitorgalvao/update-shotcut

updated shotcut
devscript project_stats show uniq new contributors
devscript: add command get_release_tag

update RELEASING.md accordingly
Merge pull request #2697 from rolandwalker/req_cask_version

make version number available within brew-cask
Merge pull request #2709 from rolandwalker/devscript_get_release_tag

devscript: add command get_release_tag
Merge pull request #2710 from rolandwalker/devscript_count_new_authors

devscript project_stats show uniq new contributors
cut v0.28.0
doc: fix some small errors in CHANGELOG.md
Merge pull request #2711 from rolandwalker/changelog_errors

doc: fix some small errors in CHANGELOG.md
doc: further update RELEASING.md

after completing release v0.28.0
Merge pull request #2695 from rolandwalker/ios7_ss_new_artifact

update ios-screensaver for artifact screen_saver
Merge pull request #2679 from jedahan/presstube-screensavers

Presstube screensavers
Lynxlet 0.8.1