Fixed some bugs from the last release!

• yaml loop expression wasn't working after the recent pull request ie. loop-node, loop-id, loop-val
• loading bukkit serializable objects causing a casting error because they wanted a string as input

Added the option to keep yaml in memory after deleting the file

• delete y[a]ml %strings% [and keep loaded in memory]

Cleaned up and updated some backend logic to all effects, expressions and conditions to help things run better in an async environment

Full Changelog: v1.7.0...v1.7.1