Remove Scene dependency from the TextServer, use scalable hex box font instead of built-in bitmap one.

[bruvzg]

Part of #53295

Removes Scene dependency from the TextServer (was used to load hex box font texture).
Instead of textures, generate hex code glyphs from the code (equivalent of 7-segment display text), also make it scalable.

Before:

After:

[akien-mga]

The "after" screenshot lacks the 0 0 hex box, is that expected?

[bruvzg]

The "after" screenshot lacks the 0 0 hex box, is that expected?

0x00 is a bug from the old version of the engine, and should be fixed in the current master (zero are control chars that should not be displayed - line breaks, zero width spaces inserted by the TextServer for justification, etc.).

[akien-mga]

Looks great! Feels cleaner too as it's well encapsulated now.

[akien-mga]

Thanks!