Adding a precompiled version of luxcore

[rostskadat]

Description

This PR aims to include a pre-compiled version of the LuxCoreRender into the FreeCAD snap.
It comes as a workaround for #104

Limitations

• Only available on amd64 (but should be able to have it for win64 and mac64 as https://github.com/LuxCoreRender/LuxCore/releases/tag/latest has binary package available for that as well)
• Only luxcoreui is available

Screenshots

[rostskadat]

This PR is not actually necessary. Here is the workaround I found:

Workaround

1. Download the latest release from LuxCoreRender/LuxCore (currently v2.6)
2. Extract into your $FREECAD_USER_HOME
3. In the bin directory create the following script and save it as luxcoreconsole.sh

#!/usr/bin/env sh

LUXCORE_BIN=$(readlink -f $(dirname $0))
LUXCORE_LIB=$(readlink -f $(dirname $0)/../lib)
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$LUXCORE_LIB
$LUXCORE_BIN/luxcoreconsole "$@"

4. Then in your preferences make sure to point to the correct path
   

5. Then in your rendering project make sure to set Batch Mode to True

Limitations

It does not work in GUI mode