Release 0.4.4 - the last with Mac OSX binaries for the near future

The main purpose of this release is to add a stable Mac OSX build. The problem: the build currently included shouldn't work on newer Macs, they require code signature. The Godot engine prior to version 3.2.3 had no signature mechanism implemented, but it was implemented in the next (3.3, I guess),  and without signature the app exports as "damaged". To have a valid Mac signature you need an Apple dev account, which is paid. So I've been using 3.2.3 to export for Mac since then. I plan to skip this part, since the current Godot version 3.4.2 is ahead in features and I had to refrain from using them to be able to export at least something for Mac. There is a fix with ad-hoc signature in this PR to Godot https://github.com/godotengine/godot/issues/48076 , but it is not merged. Currently the merge set to Godot 3.5 release milestone - when it happens, I will add Mac builds of TilePipe back.

New:

- fix bug with in Godot exporter with texture path (it was full OS path, not Godot project relative path)

- Added Mac OSX native icon