CCCP 1.7.5 release

• Fixed and optimised lesson time system
• Added the --disable-search-engine-choice-screen flag for Chromium browsers in private and guest windows to prevent the search engine selection prompt.
• Replaced timetable radio buttons with an option menu in settings for improved usability
• Created build specs file for the project to simplify the building process.
• Removed unnecessary locate buttons from project names dialog
• Fixed issue with end of lesson reminder button turning off on home screen when changing settings
• Fixed backup page and backup dialog