Consistent version.h

[sshiiden]

• Use EXTERNAL_VERSION_CONFIG in EXTERNAL_VERSION_FULL_BUILD just like VERSION_FULL_BUILD
• Use EXTERNAL_VERSION_FULL_BUILD in VERSION_FULL_NAME for consistency
• Use VERSION_FULL_NAME for godot_string in editor_node.cpp

Changes before and after

System Info before:
Blazium v4.3.stable (5590b1897) - ...
System Info after:
Blazium Engine v0.1.0.nightly (4.3.stable.custom_build) (5590b1897) - ...

Engine Console before:
Blazium Engine v0.1.0 (base v4.3.stable.custom_build) (c)...
Engine Console after:
Blazium Engine v0.1.0.nightly (4.3.stable.custom_build) (c)...

Project Manager before:
v0.1.0(4.3.stable.custom_build) [5590b1897]
Project Manager after:
v0.1.0.nightly (4.3.stable.custom_build) [5590b1897]

Terminal Output before:
Blazium Engine v0.1.0(4.3.stable.custom_build).5590b1897...
Terminal Output after:
Blazium Engine v0.1.0.nightly (4.3.stable.custom_build).5590b1897...