build system and module refactoring + simple histogram scratch (#20)

* scratch adding histogram to image views

Histograms should come from some sort of histogram service. This is
currently just a POC.

* custom logger implementation w/o spdlog

* missing cmake file

* fix tests

* use operator<< over direct stream exposure

* rm print header

* add threading test + refactor towards interface libraries

omits the need for =target_include_directories= calls /everywhere/

* rm print header

* rm constexpr

* templated thread_pool

* fix doxyfile

* default enable doc building

* czi reader refactor

* rm erroneous include expression

* clang-format

* single lib include with PUBLIC visibility

* compile imgui stdlib

* clang format

* documentation update

centralize `LogLevelToString` to `ILog.hpp`

update docs and examples

tests/CMakeLists.txt

@@ -1,17 +1,13 @@
-include(${PROJECT_SOURCE_DIR}/cmake/googletest.cmake)
+# this will trigger the FetchContent
+include(testgoogle)
 
 add_executable(libpixelarium_UnitTests
-  lib/resources/test_resource.cpp)
-
-target_include_directories(libpixelarium_UnitTests
-  PUBLIC ${PROJECT_SOURCE_DIR}/lib
-  PUBLIC ${OpenCV_INCLUDE_DIRS}
-)
-
+  lib/resources/test_resource.cpp
+  lib/utilities/test_simple_thread_pool.cpp)
 
 target_link_libraries(libpixelarium_UnitTests
-  pixelariumresourcelib
-  pixelariumimagelib
+  pixelarium::lib::resources_static
+  pixelarium::lib::imaging_static
   GTest::gtest_main
   GTest::gmock)