WebAdmin: Added "files" folder and load the login template from login_template.html
WebAdmin: Added login template
WebAdmin: Exported stylesheet in a own file.
WebAdmin: Exported favicon.
WebAdmin: Added favicon to the login template.
WebAdmin: Stop webadmin if template can't load.
WebAdmin: Exported logo and background.
Merge branch 'master' into WebAdmin
[WebAdmin] Code improvements.
Anvil: Fixed loading block entities with invalid Y coord.
Fixed security: Player cannot spawn in a disabled world.
Fixed style.
BiomeMultiCache is not used for simple generators.
Rewritten chunk status to specify whether the chunk is in queue.

This fixes #1370.
Fixed loading empty chunks.

Reported on the Dropper map in #1307.
WorldStorage no longer queues chunks into generator.
Xoft fixes.
Merge pull request #1361 from mc-server/WebAdmin

Webadmin improvements
Removed outdated message sending methods.

Fixes #1381
Fixed scoreboard loader type checks.

Fixes scoreboard loading error reported on the Dropper map in #1307.