v0.15.4c

Bratislava map unlocked! Plus changes to reinforcements and other stuff.

FEATURES:
- Bratislava is now unlocked from start (previusly needed to complete Vienna). Hospital has more credit and more elites. Look location info in map selection screen.
- Updated level selection screen with unlocked abandoned hospital.
- added RETRY button !
- Now there are marked enemies that can call reinforcements. They have icon below them.
- Reinforcements includes machete guys.
- Improvements to machete guys.
- all explosions (player's and enemy's) deal significiantly (cca 50%) less damage.
- grenade launcher attachments are significantly stronger.
- HMG weapons deal more damage overall
- Schirman is a bit faster but still slower than others
- Sobieski has unlocked health talent from Tactical tree instead Patriot tree
- nicer icon above heads.
- nicer spawned loot lights
- elites no longer sprint.
- less credit gain overall, more credit gain in hospital.
- player now has weapon unlock screen when they successfuly finish last floor in selected location. (We will add steam achievements for every unlocked weapon)

Bugs
- fixed bug with killing elite sometimes counted as non-elite kill
- minor bugs and improvements