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/minicircuits.lib

@@ -0,0 +1,40 @@
+EESchema-LIBRARY Version 2.3
+#encoding utf-8
+#
+# TC1_1_13M+
+#
+DEF TC1_1_13M+ T 0 1 Y N 1 F N
+F0 "T" 0 250 60 H V C CNN
+F1 "TC1_1_13M+" 0 -250 60 H V C CNN
+F2 "" 0 0 60 H V C CNN
+F3 "" 0 0 60 H V C CNN
+$FPLIST
+ MINICIRCUITS_AT224-3
+$ENDFPLIST
+DRAW
+A -150 -100 50 1 1799 0 1 0 N -100 -100 -200 -100
+A -150 100 50 -1799 -1 0 1 0 N -200 100 -100 100
+A -50 -100 50 1 1799 0 1 0 N 0 -100 -100 -100
+A -50 100 50 -1799 -1 0 1 0 N -100 100 0 100
+A 50 -100 50 1 1799 0 1 0 N 100 -100 0 -100
+A 50 100 50 -1799 -1 0 1 0 N 0 100 100 100
+A 150 -100 50 1 1799 0 1 0 N 200 -100 100 -100
+A 150 100 50 -1799 -1 0 1 0 N 100 100 200 100
+C -200 135 10 0 1 0 F
+C 200 135 10 0 1 0 F
+S -250 200 250 -200 0 1 0 N
+P 2 0 1 0  -250 -100  -200 -100 N
+P 2 0 1 0  -250 100  -200 100 N
+P 2 0 1 0  -200 -20  200 -20 N
+P 2 0 1 0  -200 20  200 20 N
+P 2 0 1 0  200 -100  250 -100 N
+P 2 0 1 0  200 100  250 100 N
+X SD 1 450 100 200 L 50 50 1 1 P
+X ~ 2 450 0 200 L 50 50 1 1 P
+X S 3 450 -100 200 L 50 50 1 1 P
+X P 4 -450 -100 200 R 50 50 1 1 P
+X PD 6 -450 100 200 R 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+#End Library