Initial commit: MIKILAB KiCad personal library

Self-contained KiCad library (symbols, footprints, 3D models, docs,
import/check tooling) with no dependency on kicad-personal-library.

- Fixed sym-lib-table/fp-lib-table: single (version 7) header, one entry
  per library, MIKILAB_<name> nicknames, ${KIPRJMOD}-relative URIs
- Resolved the SOT95P280X145-5N footprint collision (TPS7A2012PDBVR vs
  TPS7A2018PDBVR): confirmed byte-identical modulo KiCad's internal
  tedit timestamp, unified into one shared footprint
- Resolved a case-insensitive filename collision between the official
  Diode.kicad_sym and a custom diode.kicad_sym
- Wrapped standalone footprints (ESP32-S31-WROOM-3, IC_TPS63020DSJT,
  SOT95P280X145-5N) into their own .pretty libraries so they're
  actually registered in fp-lib-table
- Fixed broken symbol->footprint references (including one pointing at
  a nonexistent easyeda2kicad library)
- Added scripts/check_library.py, import_component.py, add_component.py,
  import_batch.py, and lib_common.py

legacy/symbols/amd.lib

@@ -0,0 +1,38 @@
+EESchema-LIBRARY Version 2.3
+#encoding utf-8
+#
+# AM6070DC
+#
+DEF AM6070DC U 0 40 Y Y 1 F N
+F0 "U" 0 850 50 H V C CNN
+F1 "AM6070DC" 0 -850 50 H V C CNN
+F2 "" -300 150 50 H I C CNN
+F3 "" -300 150 50 H I C CNN
+ALIAS AM6070ADM AM6070DM AM6070ADC
+$FPLIST
+ DIP-18_W7.62mm*
+$ENDFPLIST
+DRAW
+S -300 800 300 -800 0 1 0 N
+X E/D# 1 -500 -200 200 R 50 50 1 1 I
+X SB 2 -500 700 200 R 50 50 1 1 I
+X B1 3 -500 600 200 R 50 50 1 1 I
+X B2 4 -500 500 200 R 50 50 1 1 I
+X B3 5 -500 400 200 R 50 50 1 1 I
+X B4 6 -500 300 200 R 50 50 1 1 I
+X B5 7 -500 200 200 R 50 50 1 1 I
+X B6 8 -500 100 200 R 50 50 1 1 I
+X B7 9 -500 0 200 R 50 50 1 1 I
+X VLC 10 -500 -400 200 R 50 50 1 1 I
+X VR+ 11 500 200 200 L 50 50 1 1 I
+X VR- 12 500 100 200 L 50 50 1 1 I
+X V- 13 500 600 200 L 50 50 1 1 W
+X IOE+ 14 -500 -600 200 R 50 50 1 1 O
+X IOE- 15 -500 -700 200 R 50 50 1 1 O
+X IOD+ 16 500 -600 200 L 50 50 1 1 O
+X IOD- 17 500 -700 200 L 50 50 1 1 O
+X V+ 18 500 700 200 L 50 50 1 1 W
+ENDDRAW
+ENDDEF
+#
+#End Library