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

tests/bitmap_test/bitmap_test.cpp

@@ -21,7 +21,9 @@
 
 #include <gtest/gtest.h>
 
+#include <cstdint>
 #include <optional>
+#include <vector>
 
 TEST(basic_test, Bitmap_createBitmapWithCertainSize_yieldsSpecifiedSize) {
     auto bm     = ptprnt::graphics::Bitmap<ptprnt::graphics::ALPHA8>(16, 8);
@@ -64,3 +66,36 @@ TEST(basic_test, Bitmap_getBitmapColInsideOfImage_yieldsValidColSize) {
     auto colSize = col->size();
     ASSERT_EQ(8, colSize);
 }
+
+TEST(basic_test, Bitmap_setPixels_setsGivenPixels) {
+    auto bm = ptprnt::graphics::Bitmap<ptprnt::graphics::ALPHA8>(16, 8);
+    std::vector<uint8_t> pix(16 * 8);
+
+    bm.setPixels(pix);
+    auto pixCpy = bm.getPixelsCpy();
+
+    ASSERT_EQ(pix, pixCpy);
+}
+
+TEST(basic_test, Bitmap_setPixels_isSuccessfulWithValidPixels) {
+    auto bm = ptprnt::graphics::Bitmap<ptprnt::graphics::ALPHA8>(16, 8);
+    std::vector<uint8_t> pix(16 * 8);
+
+    ASSERT_TRUE(bm.setPixels(pix));
+}
+
+TEST(basic_test, Bitmap_setPixels_yieldsSamePixelsBack) {
+    auto bm = ptprnt::graphics::Bitmap<ptprnt::graphics::ALPHA8>(16, 8);
+    std::vector<uint8_t> pix(16 * 8);
+
+    bm.setPixels(pix);
+    auto pixCpy = bm.getPixelsCpy();
+    ASSERT_EQ(pix, pixCpy);
+}
+
+TEST(basic_test, Bitmap_setPixelsWithWrongSize_isFailing) {
+    auto bm = ptprnt::graphics::Bitmap<ptprnt::graphics::ALPHA8>(5, 8);
+    std::vector<uint8_t> pix(16 * 8);
+
+    ASSERT_FALSE(bm.setPixels(pix));
+}