(Almost looks like it could all go into ResourceLoaderModule... But that uses a different version, seemingly, the only one. 3 other subclasses of ResourceLoaderModule implement the same version of getFlip as is moved into a parent class here... Seems daft to have a different version in the base abstract class... Minor oversight?)
Some documentation
* Specify page titles as strings instead of split NS/DBK, as suggested by Roan on CR. It seemed sensible to me.
* Pass a Title object to getContent() instead of a string, to avoid unnecessary object construction overhead
* "*" and "/" are valid title characters. Check module input for JS comment end tokens.
* Fixed inappropriate conversion to boolean, when checking result of getContent(). Presumably the idea was to omit empty sections and errors, so that's what I did. Maybe an informative error message would be better in the error case.
* Use LinkBatch for selecting multiple page rows instead of Database::makeWhereFrom2d().
* Fixed assignment expression.
* Break long lines.
* Convert long or unnecessary ternary operator usages to if/else.
* Fixed excessively clever assignment expressions.
* Rename $cache to $cacheEntry.
* Removed unnecessary web invocation guards. Their perlish form was making me uncomfortable. BTW, unlike in Perl, die() is not a function, it's a special case in the PHP grammar which very roughly simulates the Perl syntax:
die "x"; // works
0 || die("x"); // works
0 || (die); // works
0 || (die "x"); // fail!
