Add "SimpleLaser" firmware support

Some new machines comes out with a controller firmware that is called "SimpleLaser".
It is an unofficial and undocumented fork of Grbl firmware, that have some issues with LaserGRBL configuration reading.
This version fix this issues and make able to read configuration even with SimpleLaser firmware.

Improve diagnostic

v5.6.0

Improve diagnostic

Bugfix: improve time measurement in case of sleep/hibernate

This release changes some low-level libraries with which LaserGRBL measures time intervals, inserting some additional checks that allow to intercept and correct the big time jumps that occur when the system is put into standby or in hibernation while LaserGRBL is running.

Bugfix #2122

This version restore a behavior of v4.9.4 where, if it is not possible to read the configuration from the machine (rare and wrong case, but existing) a value of 1000 is assumed for $30 Max PWM. This fix some issue that few user is having using v5.x

Note to the reader: it's not really a LaserGRBL bug! If configuration can't be read is a problem of the machine firmware.
I only put a patch on it!

Add power classes preview

Add power classes preview: this graph show the accumulated time for each power class (1-10%, 11-20% ... to 91-100%)

Improve Laser Lifespan Monitoring Tool

Add Time calculation for power classes, show Stress Time (stress time = power > 90%)
Fix a bug that block LaserGRBL startup if all laser are removed

Laser Lifespan Monitoring Tool

Add Laser Lifespan Monitoring Tool

Fix minor bugs

• Fix some typo in new form
• Fix some uncommon cases where the "start" button remained disabled
• Be more fault tollerant when reading configuration
• Update pt-BR translations

Add Safety Countdown

With safety countdown user are warned when the laser engraving is starting, and prompt to remember safety goggles.

Add Ukrainian Language + bugfixes

• add ukrainian language (thanks to @bossly for translating to ukrainian)
• import some hungarian translation
• be more fail-safe on weird configuration or wrong number of parameters
• add new modern splash screen