Revert "Make minsdk version match the app_target."

This reverts commit 90a908e363dc7f1c24a3f788f910b988352e2932.
Update to current SDL

That is: 8730:9b97d5eabe55
Upgrade to target sdk 18 and build for armeabi-v7a
Pause music when going to background
Fix previous commit

Damn cases with fall through!
Fix unwanted turns on soldier change

I was not clearing the state properly after turning.
Only update path preview when not scrolling