Documentation: add logo to Doxygen pages

This adds a small KiCad logo in the top left of the Doxygen pages.

54px used as 55px is maximum recommended height for Doxygen logos.

For the main docs and the dev docs, this is easily done in the Doxyfile,
for the Python docs, as that is run from the binary dir, the source dir
is passed as an Environment variable.

Documentation/development/Doxyfile

@@ -46,7 +46,7 @@ PROJECT_BRIEF          =
 # exceed 55 pixels and the maximum width should not exceed 200 pixels.
 # Doxygen will copy the logo to the output directory.
 
-PROJECT_LOGO           =
+PROJECT_LOGO           = ../kicad_doxygen_logo.png
 
 # The OUTPUT_DIRECTORY tag is used to specify the (relative or absolute)
 # base path where the generated documentation will be put.

Doxyfile

@@ -45,7 +45,7 @@ PROJECT_BRIEF          =
 # exceed 55 pixels and the maximum width should not exceed 200 pixels.
 # Doxygen will copy the logo to the output directory.
 
-PROJECT_LOGO           =
+PROJECT_LOGO           = Documentation/kicad_doxygen_logo.png
 
 # The OUTPUT_DIRECTORY tag is used to specify the (relative or absolute)
 # base path where the generated documentation will be put.

pcbnew/CMakeLists.txt

@@ -533,7 +533,10 @@ if( DOXYGEN_FOUND )
         # Create doxygen-python html
         add_custom_target( doxygen-python
             ${CMAKE_COMMAND} -E remove_directory doxygen-python
-            COMMAND ${CMAKE_COMMAND} -E env PYTHON_SOURCES_TO_DOC=${DOXYGEN_PYTHON_SOURCES_STR} ${DOXYGEN_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/Doxyfile_python
+            COMMAND ${CMAKE_COMMAND} -E env
+                PYTHON_SOURCES_TO_DOC=${DOXYGEN_PYTHON_SOURCES_STR}
+                CMAKE_SOURCE_DIR=${CMAKE_SOURCE_DIR}
+                ${DOXYGEN_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/Doxyfile_python
             WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
             DEPENDS Doxyfile_python
             DEPENDS xml-to-docstrings

pcbnew/Doxyfile_python

@@ -51,7 +51,7 @@ PROJECT_BRIEF          =
 # and the maximum width should not exceed 200 pixels. Doxygen will copy the logo
 # to the output directory.
 
-PROJECT_LOGO           =
+PROJECT_LOGO           = $(CMAKE_SOURCE_DIR)/Documentation/kicad_doxygen_logo.png
 
 # The OUTPUT_DIRECTORY tag is used to specify the (relative or absolute) path
 # into which the generated documentation will be written. If a relative path is