Pyinstaller support (#93)

* Add main.spec

* Fix issue where fetching supported extensions would crash with no default installation

main.spec

@@ -0,0 +1,64 @@
+# -*- mode: python ; coding: utf-8 -*-
+from PyInstaller.utils.hooks import collect_all
+
+# - get version from version file
+import os
+import sys
+sys.path.insert(0, os.path.abspath('.'))
+from version import APP_NAME, APP_VERSION
+
+datas = [('resources', 'resources'), ('src/engines/blender/scripts/', 'src/engines/blender/scripts')]
+binaries = []
+hiddenimports = ['zeroconf']
+tmp_ret = collect_all('zeroconf')
+datas += tmp_ret[0]; binaries += tmp_ret[1]; hiddenimports += tmp_ret[2]
+
+
+a = Analysis(
+    ['main.py'],
+    pathex=[],
+    binaries=binaries,
+    datas=datas,
+    hiddenimports=hiddenimports,
+    hookspath=[],
+    hooksconfig={},
+    runtime_hooks=[],
+    excludes=[],
+    noarchive=False,
+    optimize=0,
+)
+pyz = PYZ(a.pure)
+
+exe = EXE(
+    pyz,
+    a.scripts,
+    [],
+    exclude_binaries=True,
+    name='main',
+    debug=False,
+    bootloader_ignore_signals=False,
+    strip=False,
+    upx=True,
+    console=False,
+    disable_windowed_traceback=False,
+    argv_emulation=False,
+    target_arch=None,
+    codesign_identity=None,
+    entitlements_file=None,
+)
+coll = COLLECT(
+    exe,
+    a.binaries,
+    a.datas,
+    strip=False,
+    upx=True,
+    upx_exclude=[],
+    name='main',
+)
+app = BUNDLE(
+    coll,
+    name=f'{APP_NAME}.app',
+    icon=None,
+    bundle_identifier=None,
+    version=APP_VERSION
+)