Merge some UI improvements #8

Merged

eyakm1 merged 7 commits from feature-ui-improvements into dev

Author	SHA1	Message	Date
m4xxx1m	e27bfbd8a8	turned down the music volume	2 years ago
eyakm1	e34909565e	Implemented persistent choose of troopers	2 years ago
m4xxx1m	1eb65de5e6	GameSave for Selected Troopers	2 years ago
eyakm1	26b49e2e9d	Selected troopers savegame class implemented	2 years ago
m4xxx1m	422b1439e5	Information text in battle, buttons in session list, back button in manage squad menu	2 years ago
m4xxx1m	71fd6242fe	healing projectile	2 years ago
m4xxx1m	6e1fd803f1	changed map and added music and sounds	2 years ago