Webaccess: updated Mongoose code to version 5.4

Bump to version 4.7.1 GIT
Webaccess: fixed build on Qt5
Webaccess: updated code with the latest changes courtesy of Sergey Lyubka @ Cesanta
Plugins: Added setParameter method

HID class renamed to HIDPlugin
Added UniverseChannel parameter to inform plugins about how many channels per universe to expect
SPI plugin now handles multiple universes. Write operation moved to a thread to handle correct timings
Improved code comments
HID plugin: fixed build on Qt4
Monitor: fixed crash when loading a project with the monitor open
Engine: unified CueListRunner and ChaserRunner

Unit test still broken though !! Disabled for now
Fix unit test
SPI: added mutex locker to sync QLC+ writes and SPI writes
Webaccess: fixed Cue list play/stop sequence working only once
InputOutputManager: speed up universes refresh

SPI: do not send data if there is none
Improved some debug messages
Show Manager: fixed common speed mode for Sequence steps

Show Manager: it is no more necessary to create a Scene to add audio tracks
Show Manager: improved import of existing Functions
Show Manager: highlight the clicked step
Removed SceneSelection class
Updated Show Manager documentation
Updated translations
Chaser Editor: Sequences in Function Manager can have Run Order and Direction

Improved Chaser Editor documentation
Show Manager: avoid a startup glitch
Engine: Fixed Chaser backward direction and ChaserRunner unit test
Updates to the Spanish Translation
Merge pull request #278 from tornel/translation

Updates to the Spanish Translation
Simple Desk: CPU usage improvement. Should drastically drop down
Documentation: updated Show Manager doc (thank to Micheal Clements)
Monitor: added 2D view Fixture item editor. Can set position, rotation and gel color

Updated translations