Non-alphabet for window name would turn into '_'

**Description**
Setting window name to non-alphabet character will show as "_".

**To Reproduce**
1. In `Render properties tab - Armory Exporter - Name` set it to "()<>_+_".
2. Play and notice the window name

**Expected behavior**
Display character of window name as they are supposed to. (In our case "()<>_+_")

**System**
Blender: 2.82a
Armory: 2020.4
OS: MacOS
Graphics card: Intel Iris Pro 1536 MB

Start in Blender's Render properties tab under Armory Exporter - Name and reproduce the issue with "()<>_+_" on the stated Blender, Armory, and macOS versions. Trace how that value becomes the window name; done means the running window displays the characters as entered rather than replacing them with underscores.

Written by the indexing model from the issue text.