Remove old Qt4 workaround for missing language name of Scottish Gaelic

Force color dialog to use Qt style. Fixes some issues

- Fix missions regression: presentation of list is good, still problem with path during launching

- Fix missions regression: refactoring, WIP

Update German Lua translation

Movement Training: Revert ice girder color for consistency with TechRacer and HedgeEditor

Merge qt5transition into default

Movement training: Tweak some sprite visuals

Workaround for the weird new qgraphicsview/qgraphicsscene fitInView behavior

Movement Training: Make the use of the mission panel clearer and harder to overlook

Basic Bazooka Training: Add one more target, make limited ammo section easier, add more hints

Rope Training: Place the second-last target at a more reasonable position

Frontend: Fix built-in Qt translations not loaded properly

Update INSTALL.md about new Qt5 dependency

Fix buggy Qt5 style detection causing segfault on Arch Linux w/ qt5-style-plugins

try plastique with fallback to windows - we should find a way to alert the user that qt5-style-plugins would improve rendering

seems to help styling some - some CSS tweaks may still be needed - lobby for example

Update .hgignore to ignore new Qt's moc_ and qrc_ files

Also update default binds for SDL2 keypad names

these changed, presumably in SDL2 - might want to review all the others

Use visible team count instead of total team count to determine rendered team bar height

Remove rubber duck from BRW, RW and most weapon schemes for now The duck is not liked by players. Rubber duck needs a lot of rework. Before that happens, better remove it from game modes for now. Players can always modify the weapon schemes, of course.

Use onSkipTurn in scripts to detect turn skips

Lua API: Add onSkipTurn callback, called when hog skips