Fix bug when loading output variable

Fix bug no title bar on wx.SingleChoiceDialogs

Adding functions in EditorPanel API to let panels to define custom save methods

Fix various bugs

Fix bug variable and connection size not updated when name or expression is too long

Adding support for drag'n dropping constant values

Fix bugs on Debug Variable Panel after splitting it from PLCOpenEditor.py

Replacing buttons with text by buttons with icons
Adding support for bitmap library to have a common API for icon request handling
Simplify wx controls and sizers creation in dialogs and custom controls and panels

Adding support for drag'n dropping location without direction defined

Adding Paste POU to project node contextual menu

Adding support for exporting graph value to csv formatted string to clipboard

Adding support: when a connector's or continuation's name changed, modify names of related connections and continuations.

Fix bug editor toolbar wrong size after restoring perspective

Add support for hiding Editor toolbar when not needed

Fix bug in SetProjectProperties function when asking to not buffering project

Fix bug graphic values range not reinitialized when graphic reseted