Fixes "Too many open files"

[shoghicp]

This fixes issues with not closing resources given by PocketMine, causing a crash at a later stage. Users usually blame PocketMine for this, but it's entirely a plugin's fault.

This code was found via GitHub search, please review your code for usage of:

• Plugin->getResource() without fclose() calls later
• Not needed Plugin->getResource() calls
• fopen() calls without fclose()
• popen() calls without pclose()