Fix Logger and other build issues (#7)

This branch fixes a couple of issues with the build
- stop linking everything in a library which is then linked against a single main. It doesn't work the way I wanted. If functionality needs to be exposed by a library, it can be done later or with a separate target
- This should also fix spdlog
- Source files are now in a separate meson file using mesons files() feautre
- Improve coverage generation by adding a script generating html coverage reports. This will hopefully keep the motivation higher to create more unit tests
- Increase the code coverage a bit to demonstrate that statement above is not a fluke 😄

Reviewed-on: #7

meson.build

@@ -17,45 +17,15 @@ endif
 
 incdir = include_directories('src')
 
-ptprnt_hpps = [
-    'src/libusbwrap/interface/IUsbDeviceFactory.hpp',
-    'src/libusbwrap/interface/IUsbDevice.hpp',
-    'src/libusbwrap/UsbDeviceFactory.hpp',
-    'src/libusbwrap/LibUsbTypes.hpp',
-    'src/libusbwrap/UsbDevice.hpp',
-    'src/interface/IPrinterDriver.hpp',
-    'src/interface/IPrinterTypes.hpp',
-    'src/P700Printer.hpp',
-    'src/PtouchPrint.hpp',
-    'src/graphics/Bitmap.hpp',
-    'src/graphics/Image.hpp',
-    'src/graphics/Monochrome.hpp'
-]
-
-ptprnt_srcs = [
-    'src/PtouchPrint.cpp',
-    'src/P700Printer.cpp',
-    'src/graphics/Image.cpp',
-    'src/graphics/Bitmap.cpp',
-    'src/graphics/Monochrome.cpp',
-    'src/libusbwrap/UsbDeviceFactory.cpp',
-    'src/libusbwrap/UsbDevice.cpp',
-]
-
-ptprnt_lib = library('ptprnt', 
-                     include_directories: incdir,
-                     install: true,
-                     dependencies: [usb_dep, log_dep, pangocairo_dep, cli11_dep],
-                     sources: [ptprnt_hpps, ptprnt_srcs])
-
-ptprnt_dep = declare_dependency(include_directories: incdir,
-                                link_with: ptprnt_lib)
+subdir('src')
 
 ptprnt_exe = executable(
     'ptprnt', 
     'src/main.cpp',
     install: true,
-    dependencies : [usb_dep, log_dep, cli11_dep, ptprnt_dep],
+    dependencies : [usb_dep, log_dep, pangocairo_dep, cli11_dep],
+    include_directories: incdir,
+    sources: [ptprnt_srcs],
     cpp_args : ['-DPROJ_VERSION="'+meson.project_version()+'"'],
 )