Removed unnecessary cache queue for managing PLR feature

[digant73]

IMPROVEMENTS:

• Removed unnecessary cache queue for managing PLR feature: Standard command queue is enough to handle PLR. The removal of cache queue allowed to reduce more than 2200 bytes of memory:
• Improved error handling on PowerFailed API: Operations on files (e.g. file closure) and status variables are managed to allow a proper cleanup in any scenario (e.g. error on file opening, file reading etc...)
• loopProcessToCondition() function integrated on TASK_LOOP_WHILE macro: loopProcessToCondition renamed to loopProcessAndGUI and integrated on TASK_LOOP_WHILE macro allowing any conditional loop to handle both background and GUI interactions avoiding any sort of loop deadlock
• Added error handling on Comment API: Added error handling on Comment API to avoid possible access to NULL pointer tokens causing unexpected crashes/freezes/strange behavior during a print. Applying what is good (old implementation of API) on PR 2701 not going to be merged. All credits to kisslorand
• Minor cleanup on VFS API. Partially applying what is good in 2817 avoiding to reintroduce 2 bugs already provided by users, already fixed and explained. All credits to kisslorand
• Minor clean up, code optimization and reduction

BUGFIXES:

• Fixed wrong icon displayed on Notification menu: icon was set after the popup window was already displayed

PR STATE: Ready for merge