Move medikit healing into a separate function and clear rewards array when fully healed.
Rewrite HMedistat_Think.

Clear rewards array on fully healed humans.
Replenish stamina even if health is full.
Give medikits to players with full health even if another player is healing.
Remove redundancy, add comments, clean up the mess.
Merge branch 'gameplay/viech' into bots+viech
Change the internal representation of alien funds and make 1 evo equal 100 credits.

This doubles class costs and rewards for killing humans. Aliens can collect up to 20 evos (was 9).

Goals:
Cost and value of level[1-4]* aliens are about equal.
Both cost and value can be compared between the teams.
Allows more subtle adjustments of alien class prices.

Human equipment value stays at half its price for now. We should look into this when balancing.
Merge branch 'gameplay/viech' into bots+viech
Make bot code aware of the new signature of BG_ClassCanEvolveFromTo as changed in 8d39081.