Gtklock Versions Save

This release finally brings ext-session-lock-v1 support! Gtklock is now safer and works on many more compositors. Huge thanks to @Cu3PO42 for their work on the gtk-session-lock library.

Other changes include:

• Switched from make to meson (Thank you @lujianhua)
• Added --layout option for loading custom XML layout files (Thank you @Lassebq for the suggestion)

• Lock/Unlock commands
• Should build on FreeBSD
• Bunch of small fixes and improvements gtk4 is hopefully coming soon

fix regression that reintroduced #6

This release reworks the UI to be XML-based. It simplifies the code and keeps the UI and logic more separated. It's also a first step to adding translation.

Modules are now checked for major and minor versions.

• module version check
• code quality

• fixes and code quality
• allow changing module settings from command-line

• --version command-line flag (Thank you @nwg-piotr for inspiration)
• module version mismatch warning (Thank you @nwg-piotr for inspiration)
• caps lock warning (Thank you @emanuelserpa for suggestion)
• allow modules to add widgets over the main UI (Check out gtklock-powerbar-module)

• small fixes and code quality
• added customization options (Thank you @MelihDarcanxyz)

More module improvements

• Support loading multiple modules at once
• Load modules from system directory
• Small module fix