Scripts files for GDevelop

• ReleaseProcedure.bat: this script compiles, generates documentation (see GenerateAllDocs.bat) and packages GDevelop for Windows in an installer and an archive.
• ReleaseProcedure.sh: compiles and packages GD for Ubuntu (see Binaries/Packaging).
• CopyWindowsToLinuxReleaseFiles.sh: Copies all files in Binaries/Output/Release_Windows to Binaries/Output/Release_Linux. Call it after any change in Binaries/Output/Release_Windows.
• GenerateAllDocs.[bat|sh]: Calls doxygen to generate all documentation into docs folder.
• ExtractTranslations.[bat|sh]: Creates the source.pot file containing the strings to be translated using Crowdin.