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

cmake/implot.cmake

@@ -0,0 +1,9 @@
+include(FetchContent)
+FetchContent_Declare(
+  implot
+  URL https://github.com/epezent/implot/archive/refs/tags/v0.17.zip
+  DOWNLOAD_EXTRACT_TIMESTAMP 1)
+
+FetchContent_MakeAvailable(implot)
+
+FetchContent_GetProperties(implot SOURCE_DIR IMPLOT_DIR)