Adding custom cell editor for interval value in task informations of ResourceEditor

- Fixing editing graphic element (handles, rubberband and highlight) in graphic editor in order to make them keep the same size whatever the zoom factor applied to graphic editor
- Replace default pen by a pen with miter join property to draw graphic elements without round corner in high zoom factor
- Reduce the default size of fonts in graphic editor

Fix bug on Windows after removing "Enable Undo/Redo" menu item

Fixing bug in Variable Panel when pressing Add,Delete,Up or Down button while a cell editor in variable grid is active

Adding column for selecting task triggering in Resource Editor

Fix PrintPreview behavior

Fix bug while generating direct global array variables

Fix bug in extraction and computation of array initial value

Enabling support for direct array variable declaration

Adding support for opening newly created project element

Fix some bugs in driven drawing for LD viewer

Fix bug in SFC Transition when using connection

Disabling location definition for enumerated and structure variables
Adding support for selecting enumerated variable initial value using choice cell editor

Fix bugs in exponentiation

Fix Driven drawing in LD editor

Adding support for syntax highlighting for EN and ENO parameters in formal function and function blocs in textual editor

Fix warnings when compiling matiec

Fix bug in using STRING and WSTRING in user defined types

Improve syntax highlighting in TextViewer

Fix bug in UndoBuffer with TextViewer

Adding support for selecting user data type for function return type

Adding support for coloring following elements:
- STRING constants
- Data type in typed literals
- Function and functionBlock parameter names

Fix bug with TRUNC function and with type conversion functions called with constant as parameter

Fixing REAL_TO_INT conversion (behaved like a trunc and not like a round)

Fix bug when displaying errors when generating textual program in standalone mode

Fix bug when compiling pou including user-defined blocks with unconnected input

Fix Segmentation Fault occurring when trying to open a new editor tab

Fix wire disappearing when wire tip and connector are not exactly at the same position fixed.

Adding '0' and '1' as possible value to force boolean variables

Adding support for saving frame size while closing and restore it at next launch

Fix dialogs positions to stay on the same screen than parent frame

Fix bounding box of Variable Block when variable name displaying size is bigger than block size

Fix bug with Function Blocks input and output position on Windows

Fix bug when buffering modifications on plain text languages

Modifying data stored in UndoBuffer to get a quicker Undo/Redo

Move position of debug value to avoid wire to cross text

Fix bug in block with execution control generation fixed

Fixed typo in PLCGenerator.py

Bug when using arithmetic functions (ADD, SUB, MUL, DIV) for TIME datatypes fixed.

Adding support for debugging and forcing DATE, DT and TOD in Beremiz interface

Dhu... Merged with myself...

Added drag'n'drop of functions and function blocks

Time funcs are now in Time categoryw

Updated availables time realted function in standard lib, updated matiec code generator headers according matiec new licencing

Bug on changing variable class fixed

Adding support for displaying and forcing TIME variables according to IEC 61131 literal format

Larger library hint text window

Added POU interface description in library help text for standard function blocks too, not only in standard functions