Remove more ldlib stuff

[gustovafing]

What

• Removes usages of LDLib util classes
• Removes a bunch of UI api stuff that is now unused
• Remove all ldlib machine UI stuff, as all machine UIs now use MUI.

[YoungOnionMC]

This should be broken up into atleast 3 or 4 prs, namely
one for the moving of inworld texture usage from UITexture to GuiTextures,
one for the removal of the ldlib custom widget classes,
one for the multiblock data structure migration from ldlib to base(this also is already done in #3119 ),
one for the builder util classes cleanup, etc etc

[screret]

the multiblock preview changes should be done with the other multiblock pattern API changes in #3119 simply because this class is abysmal and should not be recreated.