The new class is pluggable, to prepare for gzipped database files.

For now, the TextFile class remains, and will be refactored away
later.

Eliminate support for partial reads.  The Linux kernel will never
return partial results, so this buffering was unnecessary.

For database plugins that don't use the UpdateService.

Enables using range-based "for".

Error message was 'too few arguments for "find"' because the "base"
constraint was not supported, and no other constraints remained.

Fixes potential crash.

Check for 0 in "device" and "inode" instead.

Remove the C list_head library and use type-safe C++ instead.

The string "base" is understood by locate_parse_type(), but not by
listAllUniqueTags().  The special tag type LOCATE_TAG_BASE_TYPE causes
a crash in PrintUniqueTag().

Fixes crash bug because mpd_connection_get_async() was called without
a connection.

Move code from CreateConfiguredDatabase() and add XDG support.  This
implements an automatic Linux fallback for the setting "db_file" if
none was specified.

Add class Context which wraps the Android/Java Context class and add a
JNI wrapper for method Context.getCacheDir().

Quick hack to allow using the database without GLib (for Android).

Lists files and directories.  Supports storage plugins.