doc: Sync classref with Variant utility methods

Copied relevant documentation from the original `@GDScript` built-ins,
which will likely be removed in a future commit.

Various fixups to `variant_utility.cpp` while working on this.
This commit is contained in:
Rémi Verschelde
2020-11-17 11:21:08 +01:00
parent 99d0df2e33
commit c6dcf3310d
4 changed files with 1235 additions and 46 deletions

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