openbor Tools

Clearning up some code.
Changes: changeplayerproperty no longer returns value. The old function doesn't return properly on every property, so just remove it for the feature is a bit useless and doesn't show the exact problem. Should print proper error messages when necessary.
Fix: defense/offense related properties now store values in entity instead of its model.

Minor change: Add ticks to openborvariant, for debug purpose. Returns system ticks in milliseconds.

Fix a bug that script save can't be loaded.

Fix: background can now be disabled using changelayerproperty.

Use default sound volume for script function playsample. All other 5 parameters are optional, except the sample index.

Updated copywrite

- Experimental script function options, opens the options menu.
- playerindex can be changed via changeentityproperty
- add current_stage, current_set, current_level to changeopenborvariant

- Bug fix: Script function free did not work.

- Fix drawmethod centerx and centery for screen.
- Add nosave abd nofadeout as level command.

Add nopause, nosave, noscreenshot to openborvariant/changeopenborvariant. (Scripted cut scene, etc).