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/trs_jack.lib

@@ -0,0 +1,54 @@
+EESchema-LIBRARY Version 2.3
+#encoding utf-8
+#
+# TRRS_SW_JACK
+#
+DEF TRRS_SW_JACK P 0 0 N Y 1 F N
+F0 "P" -450 0 60 H V C CNN
+F1 "TRRS_SW_JACK" -200 250 60 H V C CNN
+F2 "" 0 0 60 H V C CNN
+F3 "" 0 0 60 H V C CNN
+$FPLIST
+ CUI_SJ-43516-SMT
+$ENDFPLIST
+DRAW
+P 3 0 1 0  150 -200  50 -200  50 -300 N
+P 3 0 1 0  150 -100  50 -100  50 0 N
+P 4 0 1 0  50 -300  60 -250  40 -250  50 -300 F
+P 4 0 1 0  50 0  60 -50  40 -50  50 0 F
+P 4 0 1 0  150 -300  -50 -300  -75 -275  -100 -300 N
+P 4 0 1 0  150 0  -100 0  -125 -25  -150 0 N
+P 4 0 1 0  150 100  -150 100  -175 75  -200 100 N
+P 10 0 1 0  150 200  -300 200  -300 100  -325 100  -325 -300  -275 -300  -275 -50  -275 50  -275 100  -300 100 N
+X S 1 250 200 100 L 50 50 1 1 P
+X T 2 250 -300 100 L 50 50 1 1 P
+X R1 3 250 0 100 L 50 50 1 1 P
+X R2 4 250 100 100 L 50 50 1 1 P
+X TSW 5 250 -200 100 L 50 50 1 1 P
+X RSW 6 250 -100 100 L 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# TRS_JACK
+#
+DEF TRS_JACK P 0 0 N Y 1 F N
+F0 "P" -450 0 60 H V C CNN
+F1 "TRS_JACK" -100 250 60 H V C CNN
+F2 "" 0 0 60 H V C CNN
+F3 "" 0 0 60 H V C CNN
+$FPLIST
+ CUI_SJ1-352XN
+ CUI_SJ-3523-SMT
+ CUI_SJ-3524-SMT
+$ENDFPLIST
+DRAW
+P 4 0 1 0  200 -100  0 -100  -25 -75  -50 -100 N
+P 4 0 1 0  200 100  -50 100  -75 75  -100 100 N
+P 10 0 1 0  200 200  -300 200  -300 100  -325 100  -325 -100  -275 -100  -275 -50  -275 50  -275 100  -300 100 N
+X S 1 300 200 100 L 50 50 1 1 P
+X T 2 300 -100 100 L 50 50 1 1 P
+X R 3 300 100 100 L 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+#End Library