Release 90 - Small patch

This patch fixes a bunch of bugs that were reported after launch. For now I'm focusing on stability and bugfixing.

Changes:

• The log file(s) of the previous run are now preserved, to help in debugging.

Bugfixes:

• Could not open mercenaries panel while control hints were open.
• Updating drone design could cost resources when it should not.
• Switching cheap drone design for a more expensive one let you keep the same amount until they died.
• Railgun shots would pass through asteroids and friendly ships.
• The amount of XP granted from exploration was halved, resulting in reduced XP gain from mission completion.
• Distress calls were missing from the Wild Waste.
• Some edge condition could cause victory to fail when boss was defeated.
• Over-eager stall detection caused restart when rendering a frame took too long.
• Crash when loading corrupted or missing save.
• Crash on removing logfile when it is open elsewhere.
• Crash when switching to exclusive fullscreen when it is not supported in the display mode.