qgit-2.10: Merge pull request #123 from hartwork/fix-version-string

QGit version 2.10 is here. Many thanks to all the very generous contributors. Your precious time and skill investments are very much appreciated.

Notable changes:

Upgrade icons (use SVG)
Add "Commit" column to history view to show the short commit hash.
build: sync qmake config to latest changes for cmake config
Bump minimum Qt version to 5.14
Support --help, --help-all and --version in command line
Fix build on MacOS
Add option to open external diff tool on double click
Add branch name to window title
Fix loading of invalid cache file
Settings: Option to display short hash instead of full length hash
Save and restore the list view column sizes
Make drag & drop functionality optional
Make Settings dialog accessible on macOS
Improve logic to detect failed external commands under Unix-like OSes
Don't rely on STDERR for determining whether command failed
Compilation cleanup
Support for fractional device pixel ratio
Update project URLs to GitHub repo

QGit 2.9

QGit version 2.9 brings a large number of improvements from many contributors: better branch display in context menus, better general display, drag&drop of revisions, better navigation, opening of files from command line, slightly better documentation etc.

Many thanks for the great work of all those that provided code and for all the support. Enjoy!

Assorted bugfixes

Version 2.8 releases fixes for a set of issues that were reported and/or solved by QGit contributors in the last year.

Most notably, the file browsing was fixed. A set of issues with compilation on Windows was also addressed. Breakage of keybindings and menu item accelerators was also sorted out.

Many thanks to all contributors!