Small bugfixes and balance changes

This small update addresses some problems that have been reported, as well as small calculation inaccuracies that I have found in the code.

• Support for ultrawide screens have been added. the UI will no hopefully no longer break for users with uncommon aspect ratios

• Save system has been changed, this will break current runs but new saves are more stable.

• UI panels now remember their status, if a panel has been closed it will stay closed even between missions

• Fixed a calculation problem regarding Accuracy for weapons.

• Fixed a calculation problem with firerate scaling with reload speed boost instead of RPM boost

• Fixed negative firerates giving the unit infinite firerate by adding a minimum of 1RPM to the calculation

• Misc. balance changes