Created BlocklyLua.buildValueBlock in blocks.js to simplify routine block creation.
Added most blocks from the file system API.
Improved code related to buildValueBlock().
Fixed core Blockly bug (?) with flyout.
Removed unused definition.
Switched blocks-os.js to using simpler block declaration framework.
Fixed comment for BlocklyLua.buildValueBlock.
Switched definition of 'peripheral_get_names' to simpler framework.
Changed "BlocklyLua" to "Blockly.ComputerCraft".