specify app in manifest

Dependencies

• [2] BSDXVB3H backport some doc updates and renames
• [3] CYEH4AXB a prefix for metadata in the manifest
• [*] LRDM35CE app running again

Change contents

• edit in live.lua at line 141
  [3.406]

  [5.4616]
  + APP = 'fw_app'
• edit in live.lua at line 219
  [5.6312]

  [2.711]
  + Live.manifest[APP] = love.filesystem.getIdentity() -- doesn't need to be persisted, but no harm if it does..