Make swallowOkAfterResend default to True, part of the fix for #166
(cherry picked from commit 5a6cd58)
SwallowOkAfterResend isn't repetier only anymore
(cherry picked from commit 48f5a44)
Removed obsolete GcodeLoader in printer module

(cherry picked from commit a7eb5f64933313877a40a39e458e27a8fdfb8bda)
Only process gcode files during backlog processing (compare #268)