Revert "KiCad: add footprint cache (#3043)" (#3075)

This reverts commit 6ffcee971119154f1188666c92d94248fa053b8e.

KiCad.gitignore

@@ -14,9 +14,6 @@ _autosave-*
 *-save.kicad_pcb
 fp-info-cache
 
-# Footprint cache
-fp-info-cache
-
 # Netlist files (exported from Eeschema)
 *.net