v0.3

This release fixes numerous issues that were found during the first playtest (with @nabijaczleweli and @chloekek), as well as many others:

• allow clicking single unit on bottom view
• black buttons on Firefox
• selection box edge of map
• bigger clickboxes for smaller units (cylinders)?
• fix yellow cones
• command palette tooltips
• properly show resources missing when building and producing
• send proper resources to every player
• show production progress bar instead of a number
• right clicking stops production??