Output GLSL from shader compiler

This should be optimized later :-)

engine/shadercompiler/src/shadercompiler.cpp

@@ -112,6 +112,8 @@ std::optional<ShaderSource> ShaderCompiler::compile(const ShaderLanguage from_la
     }
     
     switch(to_language) {
+        case ShaderLanguage::GLSL:
+            return ShaderSource(shader_source);
         case ShaderLanguage::WGSL:
         case ShaderLanguage::SPIRV:
             return ShaderSource(spirv);