Generate labels with pangocairo (#8)

Goal of this PR is to have some basic labels generated with pangocairo
- size of the canvas should be matching the input text and grow/shrink accordingly
- basic formatting options like fontsize and align should be working

Reviewed-on: moritz/ptouch-prnt#8

src/PtouchPrint.hpp

@@ -1,6 +1,6 @@
 /* 
     ptrnt - print labels on linux
-    Copyright (C) 2023  Moritz Martinius
+    Copyright (C) 2023-2025  Moritz Martinius
 
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
@@ -58,7 +58,10 @@ class PtouchPrint {
     std::vector<CliCmd> mCommands{};
     std::string mVersionString = "";
 
-    // CLI flags
+    // CLI flags and options
     bool mVerboseFlag = false;
+    bool mTraceFlag = false;
+    std::string mPrinterSelection = "auto";
+    bool mListDriversFlag = false;
 };
 }  // namespace ptprnt