Update credits and release notes
gd translation update - superfluous word deleted
Merge pull request #893 from gunchleoc/master

gd translation update - superfluous word deleted
Increment version number in CMake file
Updated the Galician (gl) translation
Merge pull request #897 from Gallaecio/gl

Updated the Galician (gl) translation
Rename "caption" key in menu configs to "label_title"

Fixes #898
Add --help and --version command line flags

Closes #899
Merge pull request #900 from dorkster/caption_fix

Rename "caption" key in menu configs to "label_title"
Display a warning when the --game flag is omitted
Reduce scope for a variable
Merge pull request #902 from hansjoachim/reduced-scope

Reduce scope for a variable
Update engine.pl.po

Eliminating last mistakes in translation
Merge pull request #904 from Pawonashi/patch-8

Update engine.pl.po
Merge pull request #901 from dorkster/cmd_line_help

Add some command line documentation
Don't show default game warning when using --help or --version
Merge pull request #905 from dorkster/fixes

Don't show default game warning when using --help or --version
Display the default game warning on the title screen

Closes #896
Merge pull request #906 from dorkster/fixes

Display the default game warning on the title screen
Merge remote-tracking branch 'remotes/upstream/master' into render_refactor