v1.5.0

This release changes the default location for the index database under
some circumstances. Two new flags can also be used to affect the
location of the configuration (`-config`) and database (`-data`)
separately. The old `-home` flag is equivalent to setting both of these
to the same directory. When no flags are given the following logic is
used to determine the data location:

- If a database exists in the old default location, that location is
  still used. This means existing installations are not affected by this
  change.
- If `$XDG_DATA_HOME` is set, use `$XDG_DATA_HOME/syncthing`.
- If `~/.local/share/syncthing` exists, use that location.
- Use the old default location.

This logic is used on non-Windows, non-Mac platforms only. On Windows
and Mac the logic is unchanged.

Bugfixes:

- #3808: gui: Number of days must be number flashes red then disappears
- #5809: stdiscosrv failed to load keypair without proper error message
- #6410: Wrong 30-days-interval in staggered versioning
- #6430: Incorrect out-of-sync/locally changed status indication on folders
- #6436: Revert Local Changes red button does not work correctly
- #6440: Doesn't run monitor process when started with STNORESTART=1
- #6450: LDAP auth doesn't handle LDAPS with certificate validation
- #6487: Scan problem within single unignored subdirectory prevents bidirectional sync

Enhancements:

- #4924: Move index db to $XDG_DATA_HOME/syncthing/
- #5376: Improve LDAP authentication
- #6384: Do auto upgrades early and synchronously on startup
- #6416: Improve device status for "unused" devices
- #6432: Deleted file that existed locally only reported as locally changed
- #6437: Don't start browser when restarting after upgrade

Other issues:

- #6471: Windows exe isn't properly version tagged
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