Pixelgrab 1.1 Update

Added the option to view an already finished stage.

Increased the requirements to complete a level.

Increased HP formula for stage B blocks.

Added information about block HP in the help screens.

Fixed stage C poxel upgrade 'Mass Block Friction' not displaying its name correctly.

Changed some of the code in the skillmine in the hopes that this will help with optimization.

Hopefully fixed stage D sometimes not spawning upon refreshing the page.