Wings 2.2.3 release

[dgud]

--- 2.2.3 --------------------------------------------

- Improved handling of patches and plugins.
Now installs in the user data directory according to OS
recommendations this avoids tampering with the original installation.
I.e. on windows USERHOME/AppData/Local/Wings3D [dgud]

- Improve rendering of transparent faces in smooth preview. [dgud]

- Isometric view command [micheus]

- Upgraded to erlang/otp-21.2 on Windows which should improve performance on large models. [dgud]

- Boolean fixes [dgud]

- The submenu in 'AutoUV Segmentating' was shown in the wrong display for
multiple monitors layout. Thanks to OXO. [micheus]

- Exporter fixes [Julian Richardson]

- Minor fixes in Outliner and Geom Graph windows. [dgud]

- Select an element with non latin character was causing Wings3D
to crash. Thanks tkbd [micheus]