Update English mission descriptions to better fit tabbed mission menu

Mission recategorization into trainings, challenges and scenarios. This moves the missions into new folders and adds a nice tab widget in the mission menu

Fix typo in German campaign translation

Update changelog for space campaign updates

Complete space campaign's spacetrip mission if all main+side missions are completed

Draw 2 flowers for fully completed (w/ side missions) planets in space campaign

Expose number of air mines in Lua variable AirMinesNum

Add more descriptions into desktop entry files, fix some specification mismatches

Merge new Cheese map

Update changelog about campaign screen check marks

Don't show AI-controlled teams in campaigns page

Make campaign mission names translatable

Make campaign names translatable Also add German translation for both campaigns

Seperate campaign victories from campaign mission victories

Update campaign drop-down list after campaign victory

Fix final mission of Progress-based campaigns (like ACF) not being recognized as finished

Campaign page: Add labels and move start button to footer

Save mission success for A Space Adventure missions

Add support for storing and displaying success of campaign missions

Update campaign victory status when changing selection

Store campaign victories in campaign variable "Won"

Show check marks for campaigns with Won=true

Updated cheese map

Overwrite special ammo descriptions in Racer script

Allow to ignore overwritten ammo name in GetAmmoName

GetAmmoName now returns ammo name overwritten by SetAmmoTexts

Update changelog for SetAmmoTexts-related changes

Change descriptions for special Construction Mode tools

Add SetAmmoDescriptionAppendix to Lua API, see issue #82

Make SetAmmoTexts update ammo menu weapon name, too Lua API warning: SetAmmoTexts can not be called in onGameInit

Add Lua API function SetAmmoTexts (see issue #82)

Update Changelog: Add Racer and TechRacer updates