Unify variable instructions and handle local variables

[D8H]

Changes

• Global or scene variables can be used with a unique action and condition.
  • Merged from 6 conditions and 7 actions to 1 condition and 1 action:
    • global or scene variable
    • string, number and boolean
• Object variables can be used with a unique action and condition.
  • Merged from 3 conditions and 4 actions to 1 condition and 1 action:
    • object variable
    • string, number and boolean
• Instructions for string, number and boolean are actually 3 instructions but the editor switch them according to the chosen variable type
• Variables need to be declared following the same logic as the new expression syntax.
• Local variable can be declared on events
• Extensions have their own variables
  • Extension variables #6557
  • Extensions still see old instructions
• Show a diagnostic report when a preview is launched and there are missing:
  • scene variables
  • object variables
  • behaviors
  • Add a diagnostic dialog for missing variables #6573
  • This is especially useful if external events are shared between several scenes.

Out of scope

• Declare a scene/global/object variable from an expression field.
• Drag and drop local variables from one event to another
• Select and delete local variables directly from the event sheet
• Edit local variables with floating fields directly from the event sheet
• Scroll and focus on the variable name field when opening the variable editor
• Warn about variables overlapping another one from a wider scope
• Suffix identical labels with the path difference in instruction search results
• Declare local variables on any kind of event?
• Implicitly convert numbers to strings in expressions
• Make "For each children" loop accept global variables
• Replace scene variable parameters in other instructions

Demo

• TestAnyVariable.zip
• Update some examples to use new variable instructions GDevelopApp/GDevelop-examples#643

This command can help to migrate a project (which is not mandatory to do).

You will still have to:

• Update/Reinstall the extensions because they cannot use them yet (or revert the changes with git, they are at the end of the file)
• Declare the variables with the right type (or use a local variable)
• Optionally remove Variable() and GlobalVariable()
• Optionally replace variable toggle actions

sed -i 's/"VarScene"\|"VarGlobal"/"NumberVariable"/g ; s/"VarSceneTxt"\|"VarGlobalTxt"/"StringVariable"/g ; s/"SceneVariableAsBoolean"\|"GlobalVariableAsBoolean"/"BooleanVariable"/g ; s/"ModVarScene"\|"ModVarGlobal"/"SetNumberVariable"/g ; s/"ModVarSceneTxt"\|"ModVarGlobalTxt"/"SetStringVariable"/g ; s/"SetSceneVariableAsBoolean"\|"SetGlobalVariableAsBoolean"/"SetBooleanVariable"/g ; s/"SceneVariableChildCount"\|"GlobalVariableChildCount"/"VariableChildCount"/g ; s/"VariableChildExists"\|"GlobalVariableChildExists"/"VariableChildExists2"/g ; s/"VariableRemoveChild"\|"GlobalVariableRemoveChild"/"RemoveVariableChild"/g ; s/"VariableClearChildren"\|"GlobalVariableClearChildren"/"ClearVariableChildren"/g ; s/"SceneVariablePush"\|"GlobalVariablePush"/"PushVariable"/g ; s/"SceneVariablePushNumber"\|"GlobalVariablePushNumber"/"PushNumber"/g ; s/"SceneVariablePushString"\|"GlobalVariablePushString"/"PushString"/g ; s/"SceneVariablePushBool"\|"GlobalVariablePushBool"/"PushBoolean"/g ; s/"SceneVariableRemoveAt"\|"GlobalVariableRemoveAt"/"RemoveVariableAt"/g ; s/"VarObjet"/"NumberObjectVariable"/g ; s/"VarObjetTxt"/"StringObjectVariable"/g ; s/"ObjectVariableAsBoolean"/"BooleanObjectVariable"/g ; s/"ModVarObjet"/"SetNumberObjectVariable"/g ; s/"ModVarObjetTxt"/"SetStringObjectVariable"/g ; s/"SetObjectVariableAsBoolean"/"SetBooleanObjectVariable"/g ; s/"ObjectVariablePushNumber"/"PushNumberToObjectVariable"/g ; s/"ObjectVariablePushString"/"PushStringToObjectVariable"/g ; s/"ObjectVariablePushBool"/"PushBooleanToObjectVariable"/g' project.json

[4ian]

It will be interesting to see if we can pass here a VariablesContainersList at some point so the work of scoping is always done by a method of VariablesContainersList.