[FEATURE] Extension toggle to activate LLL file rebuilding

When enabled, Flux will add missing LLL labels to LLL files with a default value equal to their index name - you can use this to your advantage while in development mode; it should greatly reduce the time you spend writing LLL labels for Flux extensions!
[TASK] Remove leftover debug statement
[TASK] Correct spelling of message in LLL file rebuild method
Merge pull request #64 from NamelessCoder/autolabelsinlanguagefile

[FEATURE] Extension toggle to activate LLL file rebuilding