Avoid crashing on first installation

[lw64]

Fixes #20

[lw64]

The error that makes Godot crash for me now is that it doesn't know the symbol Terrain3dSurface in editor.gd line 27:
editor = Terrain3DEditor.new()

1. Can Godot be made aware of this symbol somehow without restarting?
2. or how can I recognize that it the plugin is run the first time and in that case open a dialog to restart godot?
3. Would that even work because the error says it cannot "compile" the script. (Though the type name appears earlier already)

[TokisanGames]

Hmm, Maybe we need to make the change in C++, as jolt does, and catch it on the first load of the extension before any gdscript loads.

Here's where jolt registers with Godot
https://github.com/godot-jolt/godot-jolt/blob/74ea8f3401aded9c9b833f886dbb4fae7bcfad04/src/register_types.cpp

This function calls register_settings(), which is where it initiates the restart
https://github.com/godot-jolt/godot-jolt/blob/74ea8f3401aded9c9b833f886dbb4fae7bcfad04/src/servers/jolt_project_settings.cpp#L56

This will require some exploration and experimentation with the C++. If it's getting beyond your comfort zone you could just limit this PR to the load image changes.

[lw64]

So this removes the error due to the script, but it still crashes for me. Not sure if its something completely different though:

WARNING: XCreateIC couldn't create wd.xic
     at: _create_window (platform/linuxbsd/x11/display_server_x11.cpp:5260)
ERROR: FATAL: Condition "!exists" is true.
   at: operator[] (./core/templates/hash_map.h:504)

================================================================
handle_crash: Program crashed with signal 4
Engine version: Godot Engine v4.1.1.stable.flathub (bd6af8e0ea69167dd0627f3bd54f9105bda0f8b5)
Dumping the backtrace. Please include this when reporting the bug to the project developer.
ERROR: FATAL: Index p_index = 1 is out of bounds (size() = 0).
   at: get (./core/templates/cowdata.h:155)

[TokisanGames]

This is going to run every time, not the first time after installing the plugin only. Alright, let's drop this commit and just go with the first commit which partially resolves the issue by removing the errors. Later someone will look into initiating a restart before the crash via C++. Thanks.

[TokisanGames]

Superseded by #196