etc/components

consider nat as a datatype in the SMT-LIB module

#built-in components
src/Tools/Demo
src/Tools/Find_Facts
src/Tools/jEdit
src/Tools/GraphBrowser
src/Tools/Graphview
src/Tools/Setup
src/Tools/VSCode
src/HOL/Mutabelle
src/HOL/Library/Sum_of_Squares
src/HOL/SPARK
src/HOL/Tools
src/HOL/TPTP