update webgl cmake with file copy and version gen

webgl/CMakeLists.txt

@@ -1,6 +1,9 @@
 cmake_minimum_required(VERSION 3.4.1)
 project(panopainter)
+file(COPY ../data
+    DESTINATION ${CMAKE_CURRENT_BINARY_DIR})
 add_executable(panopainter 
+    ../src/version.gen.h
     src/main.cpp
     ../libs/yoga/yoga/log.cpp
     ../libs/yoga/yoga/Utils.cpp
@@ -129,3 +132,12 @@ target_include_directories(panopainter PRIVATE
     ../libs/glad/include
     ../libs/tinyfiledialogs
 )
+add_custom_command(
+    OUTPUT  ../src/version.gen.h
+	COMMAND python scripts/pre-build.py release
+	WORKING_DIRECTORY ../../
+)
+add_custom_target(
+    gen_version ALL
+    DEPENDS ../src/version.gen.h
+)