feat: add seamlyme splash screen

[DSCaskey]

This adds a "Coming Soon..." splash screen (w/delay) to the SeamlyMe application.

resolves issue #1047

[ghost]

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[what-the-diff]

🎉 Pull Request Summary 🎉

This PR consists of several revamps and fresh introductions to our codebase that make our system more effective and up-to-date. Here is the simplified journey of this update:

• Capitalization adjustment in main.cpp files of both seamly2d and seamlyme directories: This may seem like a small tweak, but it actually enhances our code readability and consistency! Good job, team! 😊

  • The function name InitHighDpiScaling was tastefully renamed as initHighDpiScaling.

• Enhancements and additions to main.cpp in seamlyme: 🔥

  • The file now has a fresh header with the latest date and updated copyright information.
  • Welcoming our new participant - QSplashScreen. 👏
  • Some function name transforms to raise our readability bar: The ProcessCMD is now known as processCommandLine! 😄
  • Say hello to two new functions: NewMainWindow and ParseCommandLine. These additions will no doubt enhance our application's functionality. 😎
  • The faithful InitTrVars function had an update to keep it in sync with our needs.
  • There's a new slot in town! –processCommandLine.

• More function renaming in mapplication.cpp and mapplication.h in seamlyme: 🔄

  • Continuing our naming consistency endeavor, the ProcessCMD function metamorphosed into processCommandLine.
  • The InitTrVars function also received some updates here.

• Sprucing up seamlyme.pro: 🎈

  • The addition of a new resource file splash.qrc sets the ground for an exciting visual update.
  • Added a new image file Coming Soon.png to the resource file, keeping our users in suspense! 🙈

• Renaming functions in def.cpp and def.h in src/libs/vmisc: 🔄😄

  • Maintaining our style guide across codebase, InitHighDpiScaling was renamed as initHighDpiScaling.

Remember every edit, every line of code adds value to our great product! Let's keep up the good work everyone! 🚀👩‍💻👨‍💻🌟