d/jak2: finish find-nearest | trajectory | editable-h and most of editable and editable-player (#1847)

Also made a first-pass of their SQL schema in preparation for getting
that working.

scripts/gsrc/code_retention/code_retention.py

@@ -114,7 +114,7 @@ def lookahead_for_code(lines, index):
 
 # returns form, or none
 def is_line_start_of_form(line):
-    if line.lstrip().startswith(";"):
+    if line.lstrip().startswith(";") or "(when *debug-segment*" in line:
         return None
     matches = re.search(r"\(\s*([^\s.]*)\s+", line)
     if matches is not None: