Script loading errors

[CuriousMike56]

Various scripts (mainly those with GUI windows) are failing to load now:

road_editor.as (87, 5): Info = Compiling void TerrainEditor::drawWindow()
road_editor.as (92, 51): Error = Not a valid reference

demo_script.as (339, 1): Info = Compiling void drawDocumentWindow()
demo_script.as (343, 36): Error = Not a valid reference

example_RigEditor_alpha.as (402, 20): Error = Identifier 'GridViewer' is not a data type in global namespace

example_ogre_characterPosing(skelAnims).as (80, 5): Info = Compiling void PoseDemo::drawSetupButton()
example_ogre_characterPosing(skelAnims).as (108, 26): Error = No matching symbol 'setMaterialName'

example_ogre_terrnBatcher.as (28, 1): Info = Compiling void frameStep(float)
example_ogre_terrnBatcher.as (30, 9): Error = No matching signatures to 'ImGui::Begin(const string, void, const ImGuiWindowFlags)'
example_ogre_terrnBatcher.as (30, 9): Info = Candidates are:
example_ogre_terrnBatcher.as (30, 9): Info = bool Begin(const string&in, bool&inout, int = 0)

example_ogre_inspector.as (28, 9): Error = No matching symbol 'ImHyperlink'

example_game_shockTuning.as spams this error in console while on foot:

10:32:06: The script ended with exception; details below:
10:32:06: 	context.ExceptionLineNumber: 221
10:32:06: 	context.ExceptionString: Null pointer access
10:32:06: 	context.ExceptionFunction.Declaration: void frameStep(float)
10:32:06: 	context.ExceptionFunction.ModuleName: example_game_shockTuning.as(category:CUSTOM,unique ID:14)
10:32:06: 	context.ExceptionFunction.ScriptSectionName: example_game_shockTuning.as
10:32:06: 	context.ExceptionFunction.ObjectName: 

Other scripts may also be affected, these are the only ones I've checked so far.

[CuriousMike56]

Fixed with #3197